hot sensation/weird very hot rush down her right arm that was vaccinated and went up the back of her neck only on the right side; dizzy; Heart racing; Her arm was very sore- it was difficult to lift it; Her arm was very sore- it was difficult to lift it; She did feel a little out of it, as it produced a little bit of anxiety; A mild allergic reaction; This is a spontaneous report from a contactable Other Health Professional (patient). A 43 years old female patient received 1st dose of bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, lot: EL3248, Expiration Date: Apr2021), via an unspecified route of administration on 12Jan2021 at 13:22 at single dose on right arm for covid-19 immunisation. Medical history included vasovagal (she did have a history of vasovagal. She talked to her doctor about this prior to the vaccine. At first when she had it her previous doctor felt a little confused. She was unsure if it was vasovagal or a blood clot in her lungs. She did get it checked out with a cat scan and there was no clot. They had to have tested her for anaphylaxis at that time. It was not a clear diagnose. Then she saw a cardiologist. She was diagnosed with vasovagal at that time. It lasted only a few months and she was fully recovered). Concomitant medications included ongoing ergocalciferol (VIT D) and ongoing vitamins NOS (MULTIVITAMIN). Patient received the vaccine on Tuesday, 12Jan2021. Her appointment was at 12:54, but she got the vaccine at 13:22. She was looking at her phone to re-schedule her second dose. She felt totally fine. At 13:27 she had this weird very hot rush down her right arm that was vaccinated and went up the back of her neck only on the right side. She looked up from her phone and was very dizzy. She stood up and as she did her heart started to race. It was a really weird feeling that she has never felt. She was a little out of it. She had no trouble breathing. Within 30 seconds she was completely fine. She did feel a little out of it, as it produced a little bit of anxiety. She had no other symptoms. She stayed at the facility for 30 minutes. As she was leaving one person asked how she felt and she was told to let the EMTs know. She let them know what happened. One woman working there said it could have been an anxiety attack. She did not have a lot of anxiety but she did have some. It did not feel like that. She had never had the warm sensations or heart racing. She was totally fine when talking to the EMTs. They did not seem concerned and they let her schedule her second shot. She read on Pfizer about allergic reactions. She was assuming this was what happened. A mild allergic reaction. She had no breathing issues or hives. Her arm was very sore- it was difficult to lift it. She had also never had this type of soreness with vaccines. Dizziness: She has had the dizziness a couple of times. Twice now. One when she had gotten home. It was very mild and nothing compared to what she had when she got the vaccine. Then another last night at bedtime. It was a woosh of dizziness.  Arm soreness: very improved now. felt like she would normally have after getting a vaccine. The first day was intense but after a few hours was less. The next day she woke up and it was pretty much gone. She still had a little but it has mostly improved. Caller stated she would still like to get the second dose but she was a little nervous. She had it maybe once or twice since then and it has been mild with no extreme pressure drops. They thought maybe it was a virus that affected her. Her reaction to the vaccine was different. The difference was pretty significant. Vasovagal felt like her heart will stop and she will pass out. After the vaccine she felt dizzy but didn't feel faint, and had a racing heart. Nobody seemed concerned about her reaction and getting the second dose. But she read that Pfizer does not recommend getting the second dose even if you had a mild reaction. She was wondering what she should do. Her second dose is scheduled for 02Feb2021. Outcome of hot sensation/weird very hot rush down her right arm that was vaccinated and went up the back of her neck only on the right side and heart racing was resolved on 12Jan2021, dizzy was resolved on 13Jan2021, outcome of anxiety was unknown, outcome of her arm was very sore- it was difficult to lift it  and a mild allergic reaction was resolving.