Started to feel pain in my chest / increased chest pain; some shortness of breath; Increased heart rate while laying down worse when I got up /  my heart rate was high; completely wiped out of any energy; I did not sleep well; I was nauseous too; headache / unbearable headache; anxiety; started having muscle spasms in legs; Both doctors said I should not get the second Vaccine; This spontaneous case was reported by a consumer and describes the occurrence of TACHYCARDIA (Increased heart rate while laying down worse when I got up /  my heart rate was high), CHEST PAIN (Started to feel pain in my chest / increased chest pain) and DYSPNOEA (some shortness of breath) in a 50-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. 020B21A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     The patient's past medical history included Hay fever (Allergic History) and Hives (Allergic history). Concurrent medical conditions included Anaphylaxis, Hypersensitivity reaction, Asthma (Allergic reaction), Allergy to insect sting (Anaphylaxis), Penicillin allergy, Allergy to antibiotic (Allergy to sulfa.) and Multiple sclerosis since 01-Oct-2000.    On 02-Apr-2021 at 1:00 PM, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 02-Apr-2021,  after starting mRNA-1273 (Moderna COVID-19 Vaccine), the patient experienced INTENTIONAL PRODUCT MISUSE (Both doctors said I should not get the second Vaccine). On 03-Apr-2021, the patient experienced MUSCLE SPASMS (started having muscle spasms in legs). On 04-Apr-2021, the patient experienced TACHYCARDIA (Increased heart rate while laying down worse when I got up /  my heart rate was high) (seriousness criterion hospitalization) and ANXIETY (anxiety). On 06-Apr-2021, the patient experienced CHEST PAIN (Started to feel pain in my chest / increased chest pain) (seriousness criterion hospitalization), DYSPNOEA (some shortness of breath) (seriousness criterion hospitalization) and HEADACHE (headache / unbearable headache). On 10-Apr-2021, the patient experienced INSOMNIA (I did not sleep well) and NAUSEA (I was nauseous too). On 11-Apr-2021, the patient experienced MALAISE (completely wiped out of any energy). The patient was hospitalized from 07-Apr-2021 to 09-Apr-2021 due to CHEST PAIN, DYSPNOEA and TACHYCARDIA. The patient was treated with ALPRAZOLAM (XANAX) on 06-Apr-2021 for Anxiety, at an unspecified dose and frequency; OXYGEN on 07-Apr-2021 for Shortness of breath, at an unspecified dose and frequency; NITROGLYCERIN (sublingual) on 07-Apr-2021 for Chronic chest pain, at a dose of .4 mg every five minutes; AMLODIPINE BESYLATE on 09-Apr-2021 for Adverse event, at a dose of 5 mg at bedtime; ISOSORBIDE MONONITRATE on 09-Apr-2021 for Adverse event, at a dose of 30 mg, OD; METOPROLOL TARTRATE on 09-Apr-2021 for Adverse event, at a dose of 25 mg twice a day; PARACETAMOL (TYLENOL) on 11-Apr-2021 for Headache, at an unspecified dose and frequency and NAPROXEN SODIUM (ALEVE) on 11-Apr-2021 for Headache, at an unspecified dose and frequency. On 02-Apr-2021, INTENTIONAL PRODUCT MISUSE (Both doctors said I should not get the second Vaccine) had resolved. At the time of the report, TACHYCARDIA (Increased heart rate while laying down worse when I got up /  my heart rate was high), CHEST PAIN (Started to feel pain in my chest / increased chest pain), DYSPNOEA (some shortness of breath), MUSCLE SPASMS (started having muscle spasms in legs), MALAISE (completely wiped out of any energy), INSOMNIA (I did not sleep well), HEADACHE (headache / unbearable headache), NAUSEA (I was nauseous too) and ANXIETY (anxiety) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On 05-Apr-2021, Blood pressure measurement: 109/74 mmHg (Low) 109/74. On 05-Apr-2021, Body temperature: 98.4 (normal) 98.4. On 05-Apr-2021, Heart rate: 62-160 (abnormal) 62-160. On 05-Apr-2021, SARS-CoV-2 test: negative (Negative) negative. On 06-Apr-2021, Blood pressure measurement: 114/79 mmHg (normal) 114/79. On 06-Apr-2021, Body temperature: 98.6 (normal) 98.6. On 06-Apr-2021, Heart rate: 54-152, 160 (abnormal) 54-152, 160. On 07-Apr-2021, Blood pressure measurement: 113/67 mmHg (Low) 113/67. On 07-Apr-2021, Body temperature: 98.6 (normal) 98.6. On 07-Apr-2021, Heart rate: 49-149 (abnormal) 49-149. On 08-Apr-2021, Blood pressure measurement: 110/67 mmHg (Low) 110/67. On 08-Apr-2021, Body temperature: 98.5 (normal) 98.5. On 08-Apr-2021, Computerised tomogram: normal (normal) CT with Contrast and that was fine.. On 08-Apr-2021, Heart rate: 58-149 (abnormal) 58-149. On 09-Apr-2021, Blood pressure measurement: 110/74 mmHg (normal) 110/74. On 09-Apr-2021, Body temperature: 98.7 (normal) 98.7. On 09-Apr-2021, Heart rate: 53-194 (abnormal) 53-194. On 09-Apr-2021, Scan myocardial perfusion: no blockages (normal) no blockages.     mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown) was withdrawn on an unknown date.   For mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown), the reporter did not provide any causality assessments.   Patient mentioned of having muscle spasms in her leg even though she had a Baclofen pump. Patient said doctors believed that she was either having spasms of heart or spasms of the esophagus. No concomitant medications were reported. On 09 Apr-2021, patient underwent Echocardiogram, for which results were not provided. Company comment: Based on the current available information and temporal association between the use of the product and the start date of the events, a causal relationship cannot be excluded.; Sender's Comments: Based on the current available information and temporal association between the use of the product and the start date of the events, a causal relationship cannot be excluded.