short of breath; got weak and lightheaded like he could not go on; got weak; he did not know what was going on; pain through arm; could feel the pain where they stuck him; could feel the pain where they stuck him, this morning, it is now from his arm to his back; having back spasms and he is feeling that again; throwing up/threw up what he ate this morning/threw up twice; This is a spontaneous report from a contactable consumer, patient.  A 31-years-old male patient received first dose of bnt162b2 (PFIZER BIONTECH COVID 19 VACCINE, formulation: solution for injection, lot number was not reported) via an unspecified route of administration, in arm left on 24Mar2021 at 10:00 as dose 1, single (age at vaccination 31 years) for covid-19 immunisation. Medical history included high blood pressure, that was taken care of, it was under control and was diagnosed around 2013, illness, he had covid, he was having back spasms. The history of previous immunizations was none. Concomitant medication(s) included cetirizine that he was taking for the illness, he started taking the same day as the other ones, he was not sure the exact date; amoxicillin that he was only on for probably 2 or 3 days, taken for illness; benzonatate taken for illness, it was reported that amoxicillin he took only once, and the other medication only twice and added this was for the same thing when he got sick. On 24Mar2021 the patient experienced pain through arm, once they gave him the shot, he came back and sat down and could feel the pain where they stuck him. This morning, it was now from his arm to his back on an unknown date in 2021. He added that it was like when he had covid he was having back spasms and he was feeling that again on an unknown date in 2021. It was off and on, he still felt it in his arm. Clarified as left arm. The patient reads gas meters, he was walking and got weak and lightheaded like he could not go on. He sat on the ground before it got worse on 25Mar2021. Someone had to come pick him up because he did not know what was going on, on 25Mar2021. Being lightheaded is still going on. It was the same because he was just lying in bed and not doing anything. On 25Mar2021 the patient was short of breath. When he sat down, everything calmed down. This was not still going on. Clarified that this occurred around 9 am today. On an unknown date in 2021 caller added that they came and picked him up and he had to walk to his vehicle to return the vehicle that he has for the company. As he was getting ready to leave, he threw up twice. He has not thrown up since. The patient stated they put him on antibiotics right before he got the vaccine. He added that he stopped taking those before he got the shot because he did not want to mix it. He stopped taking the mediations more than 2 weeks prior to him getting the vaccine. No therapeutic treatment was taken in response to the events. No additional vaccines were administered on same date as suspect. The events did not require visit to ER or physician office. There were no adverse evets following prior vaccinations. The patient was a military veteran. There were no relevant lab tests. The outcome of the events pain from his arm to his back and having back spasms was unknown, for rest of the events was not recovered and for short of breath and throwing up was recovered on an unknown date in 2021.  No follow-up attempts are needed. information about lot/batch number cannot be obtained.