Stomach feels queasy; woke up weak and exhausted; barely able to move left arm / Left arm still painful for even slight movement or touch; barely able to move left arm / Left arm still painful for even slight movement or touch; full-body rash; Hard dark red skin covering face; No appetite; Slept most of the day to keep warm / Unable to stay awake for more than a few minutes at a time.; chills; intense shivering; Unable to stay warm even under a pile of blankets / Slept most of the day to keep warm; Pounding heartbeat reduced by breathing exercises; This is a spontaneous report from a non-contactable consumer, the patient. A 66-year-old non-pregnant female patient received the second dose of BNT162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE; Lot Number: EW0158) via an unspecified route of administration in the left arm on 09Apr2021 at 13:45 (at the age of 66-years-old) as a single dose for COVID-19 immunisation. Medical history was not reported. Concomitant medications included colecalciferol (VITAMIN D3) and vitamin B complex (MANUFACTURER UNKNOWN), both taken for unspecified indications from unknown dates. The patient previously received the first dose of BNT162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE; Lot Number: EN6207) via an unspecified route of administration in the left arm on 19Mar2021 as a single dose for COVID-19 immunisation. Prior to the vaccination, the patient was not diagnosed with COVID-19. Since the vaccination the patient had not been tested for COVID-19. The patient did not receive any other vaccines within four weeks prior to the vaccination. On 10Apr2021 at 16:30, the patient experienced chills and intense shivering which increased throughout the night. The patient was unable to stay warm even under a pile of blankets. The patient had pounding heartbeat which was reduced by breathing exercises and meditation until she dozed off, she was reawakened every time by the same pounding heartbeat. On 11Apr2021, the patient woke up weak and exhausted, barely able to move left arm, had full-body rash and hard dark red skin covering face, no appetite and slept most of the day trying to stay warm. On 12Apr2021, the patient was unable to stay awake for more than a few minutes at a time, slept most of the day to keep warm, ate lightly, the full-body rash and hard red facial skin were still present and the left arm was still painful for even slight movement or touch. On 13Apr2021, the patient was still weak but the body rash and facial redness had gone and her stomach felt queasy. The patient was able to eat two light meals and take a brief evening walk but the arm still hurt. On 14Apr2021, the patient tried to resume some activity, no strenuous exercise which was her norm and ate lightly, the arm felt much better. The events did not result in doctor or other healthcare professional office/clinic visit, and emergency room/department or urgent care. Therapeutic measures were not taken as a result of the events. The clinical outcome of the events body rash and facial redness were resolved on 13Apr2021, while the clinical outcome of the events chills, shivering, heart pounding, sleepy, weakness, unable to stay warm, barely able to move and painful left arm, no appetite and stomach felt queasy were resolving at the time of this report.  No follow-up attempts are possible. No further information is expected.