Lower back pain; It feels like severe flu; Low grade fever; sinus you know going on like crazy; Fatigue/extreme fatigue; Joint pain; I spent most of the last 2 days sleeping; This is a spontaneous report received from a contactable reporter(s) (Nurse). The reporter is the patient.  A male patient received BNT162b2, BNT162b2 omi ba.4-5 (BNT162B2, BNT162B2 OMI BA.4-5), on 10Oct2022 as dose number unknown (booster), single (Lot number: GH9703) for covid-19 immunisation. The patient's relevant medical history included: "Viral myocarditis", start date: 2014 (unspecified if ongoing), notes: I have viral myocarditis, I was diagnosed back in 2017, actually 2014; "congestive heart failure" (unspecified if ongoing). Concomitant medication(s) included: TYLENOL; ASPIRIN [ACETYLSALICYLIC ACID]; LISINOPRIL; SPIRONOLACTONE; WARFARIN taken for anticoagulant therapy; RESVERATROL; TAURINE taken for cardiac failure congestive; MAGNESIUM; CARVEDILOL; VITAMIN D3 VITAMIN K1; VITAMIN D3 K2; PQQ. Vaccination history included: Covid-19 vaccine (PRIMARY SERIES IMMUNIZATION COMPLETED), for COVID-19 immunization. The following information was reported: BACK PAIN (non-serious), outcome "unknown", described as "Lower back pain"; INFLUENZA LIKE ILLNESS (non-serious), outcome "recovering", described as "It feels like severe flu"; PYREXIA (non-serious), outcome "unknown", described as "Low grade fever"; SINUS DISORDER (non-serious), outcome "unknown", described as "sinus you know going on like crazy"; FATIGUE (non-serious), outcome "unknown", described as "Fatigue/extreme fatigue"; ARTHRALGIA (non-serious), outcome "unknown", described as "Joint pain"; SOMNOLENCE (non-serious), outcome "unknown", described as "I spent most of the last 2 days sleeping". Relevant laboratory tests and procedures are available in the appropriate section.  Additional information: Transferring agent stated, "I have a nurse on the line wanting to report some symptoms that he had after receiving the Pfizer Covid-19 Bivalent vaccine. He received the dose on 10Oct and that will, he had a lot of lower back pain, and he think what if he could have taken Tylenol for this." When paraphrased the concern: Nurse stated, "It is correct. You know I had all of the reported side effects from this. It feels like severe flu, its getting little bit better today and you know, low grade fever, sinus you know going on like crazy, extreme fatigue, excessive joint pain, and I spent most of the last 2 days sleeping, you know its getting better so I am not you know overly concerned but lower back is really pronounced and I was diagnosed with viral myocarditis (Medical condition) in 2014 and it is been well managed, I have not had any of that for that. So, anyway I just want to know, you know, and I am always cautioned by them, I can't take Aspirin. I have to take Tylenol etcetera than usual. I did nursing care for oncology on geriatric patients for 20 years and I had to stop though when I got medical (unclear and incomplete sentence)." Nurse stated, "I am sorry there is no barcode on the vaccination record card I would see from them. Expiration date: Nurse stated, "It is just the date of administration, it was 10Oct2022."(Further clarification unknown). Medical Conditions: Nurse stated, "No, I have viral myocarditis, I was diagnosed back in 2017, actually 2014 and that is been well managed without the (unclear word) and I am '71'(further could not be clarified) years old as of today." Concomitant medication: Nurse stated, "Yeah, actually I am. In terms of prescription, you want prescription drugs first? Ok, the prescription drugs are pretty standard. Lisinopril, Carvedilol, Spironolactone. I am on blood thinners Warfarin. Ok, so that's just the prescription medication. I do maintain a bunch of supplements that has actually helped and seems to be reversing some of the effects of cardiac remodeling (further clarification unknown) somewhat in the heart. First one is Resveratrol, Vitamin D3 with K1 and K2 (further clarification unknown. Hence, not captured in tab) and I do 200 milligrams of that daily. Taurine and I do 2 grams of that daily and that is standard protocol for congestive heart failure (further clarification unknown) in Japan and UK by the way. I mentioned the vitamin D3, PQQ that is a form of coenzyme Q10 that actually gives me significant booster energy and Magnesium that is one of the main thing that my cardiologist gave me from day 1." Lab test: Nurse stated, "I just had a recent blood work and after checked my bowel. It is about 3 weeks old."(further clarification unknown). Call disconnected abruptly and no further probing could be done. Call back was done however unsuccessful. Hence, limited information was available over the call.  No follow-up attempts are possible. No further information is expected.