been feeling hot and too warm; diarrhea; sore left arm; body aches; terrible stomach pains; rash on her left arm in the injection site area; The rash was warm to the touch and itchy; nausea; disequilibrium; vertigo/Vertigo has been worse extremely worse feels like I am on a boat; This spontaneous case was reported by a patient and describes the occurrence of BALANCE DISORDER (disequilibrium), VERTIGO (vertigo/Vertigo has been worse extremely worse feels like I am on a boat), FEELING HOT (been feeling hot and too warm), ABDOMINAL PAIN UPPER (terrible stomach pains) and DIARRHOEA (diarrhea) in a female patient of an unknown age who received mRNA-1273.815 (SPIKEVAX 2023-2024 PFS) (batch no. 203E23A) for COVID-19 prophylaxis. The occurrence of additional non-serious events is detailed below.     The patient's past medical history included Autoimmune disorder in 2005, Tick bite in 2005 and Lyme disease (with MS Symptoms).    On 23-Sep-2023, the patient received sixth dose of mRNA-1273.815 (SPIKEVAX 2023-2024 PFS) (unknown route) 1 dosage form. In 2023, the patient experienced BALANCE DISORDER (disequilibrium), VERTIGO (vertigo/Vertigo has been worse extremely worse feels like I am on a boat) and NAUSEA (nausea). On 25-Sep-2023, after starting mRNA-1273.815 (SPIKEVAX 2023-2024 PFS), the patient experienced VACCINATION SITE RASH (rash on her left arm in the injection site area) and RASH PRURITIC (The rash was warm to the touch and itchy). On 27-Sep-2023, the patient experienced ABDOMINAL PAIN UPPER (terrible stomach pains). On an unknown date, the patient experienced FEELING HOT (been feeling hot and too warm), DIARRHOEA (diarrhea), VACCINATION SITE PAIN (sore left arm) and MYALGIA (body aches). The patient was treated with HYDROCORTISONE for Rash, at an unspecified dose and frequency. At the time of the report, BALANCE DISORDER (disequilibrium), VERTIGO (vertigo/Vertigo has been worse extremely worse feels like I am on a boat), FEELING HOT (been feeling hot and too warm), DIARRHOEA (diarrhea), VACCINATION SITE PAIN (sore left arm), MYALGIA (body aches) and NAUSEA (nausea) outcome was unknown and ABDOMINAL PAIN UPPER (terrible stomach pains), VACCINATION SITE RASH (rash on her left arm in the injection site area) and RASH PRURITIC (The rash was warm to the touch and itchy) had resolved.        For mRNA-1273.815 (SPIKEVAX 2023-2024 PFS) (Unknown), the reporter did not provide any causality assessments.   Concomitant medication included blood pressure medications.  The patient received her first Moderna Covid-19 vaccine on 24-Mar-2021 (lot number: 020B21A, Expiration date: 09-Sep-2021), Second Moderna Covid-19 vaccine on 21-Apr-2021 (lot number: 001C21A, Expiration date: 12-Oct-2021), Third Moderna Covid-19 vaccine on 26-Oct-2021 (lot number: 039C21A, Expiration date: 29-Oct-2021), Fourth vaccine 05-Apr-2022 vaccine listed as Spikevax Moderna (lot number: 033K21-2A, Expiration date: 20-May-2022) and fifth vaccine on 13-Sep-2022 vaccine listed as Moderna Bivalent Spikevax (lot number: AS7148B, Expiration date: Unknown).  Patient had more side effects and was not feeling well with this vaccine. Initially the patient had a sore left arm and body aches. On Monday 25-Sep-2023, the patient noticed a rash on her left arm in the injection site area. The rash was warm to the touch and itchy. The patient put over the counter Hydrocortisone Cream on the rash and the rash cleared up in a week. On Wednesday 27-Sep-2023 and into 28-Sep-2023, the patient woke up in the middle of the night with terrible stomach pains. For 5 days the patient had terrible stomach pains like a GI bug. Patient had diarrhea. The patient on Sunday noticed an increase in her disequilibrium, vertigo, and nausea. Patient felt it 10 times worse than any previous disequilibrium attack. Patient has preexisting disequilibrium and since her Spikevax vaccine the Vertigo has been worse extremely worse feels like she was on the boat. The patient has also been feeling hot and too warm. The patient does not have a temperature. Patient had the window cracked open, but it felt hot.   This case was linked to US-MODERNATX, INC.-MOD-2023-744199, US-MODERNATX, INC.-MOD-2023-744221 (E2B Linked Report).; Sender's Comments:  US-MODERNATX, INC.-MOD-2023-744199:Mono valent case US-MODERNATX, INC.-MOD-2023-744221:Bivalent Case