had stomach issues; had some heart palpitations; This is a spontaneous report from a contactable consumer (Patient, reported for herself).  A 44-year-old female patient received BNT162B2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE; solution for injection, Lot Number: Unknown), via an unspecified route of administration, on 06Aug2021 as a dose 1, single for COVID-19 immunization. On 19Mar2021 the patient had COVID. Patient reported that she had some antibodies and did antibody test. Patient was afraid to take the COVID vaccine too soon because she was still dealing with some residual effects of COVID. The concomitant medications of patient included ergocalciferol (VITAMIN D [ERGOCALCIFEROL]) and vitamin c [ascorbic acid] (VITAMIN C [ASCORBIC ACID]). Patient concomitant medications were ongoing. She takes vitamin D, it is prescribed to her, once a week but she took it several days before she had the COVID vaccine. And then with the whole COVID thing she has been taking vitamin C periodically to boost her immune system. She might of taken that one within the 2 week before her COVID vaccine. Probed for start dates and this was unable to obtain but she provided that she took the vitamin D and vitamin C within two weeks prior to her having the COVID vaccine. She has the chewable vitamin C and she thinks that it is either 250 or 500 maybe and her vitamin D is 50,000 units. Patient waited until she felt better to get the COVID vaccine. To make a long story short she says that she took the COVID vaccine on Friday, 06Aug2021, her first dose, and it was approximately 4 months after getting COVID and getting sick. She knows that it was recommend to wait 90 days afterwards and she said that she would give it a few extra days and so she did wait for 4 months. That was that but then soon after she had the COVID vaccine she began not feeling well. She wasn't able to go to lunch with her friends because she was so tired. She had some heart palpitations on 09Aug2021 and 10Aug2021 and she thought that was due to her body maybe making antibodies. Then on Thursday, 12Aug2021, she had stomach issues. She has never had that before even with COVID. She has never had this pain in her upper tummy. It was like she had little burps, like little bubbles, so she thought that it was maybe acid reflux but the pain that was associated with it in her stomach grew for 2 days. She still has it now but it is not near as bad as it was on 12Aug2021, 13Aug2021 and 14Aug2021. On 14Aug2021 it was moderate and then it came back a little worse last night for some reason but she doesn't know why and now it was tapering off and she was hoping that there was no correlation between her side effects and the COVID vaccine, she is hoping and praying for that. Otherwise she was going to have so much anxiety around that. Today was 19Aug2021 and yesterday she felt it slight and today she doesn't know if it is resolved, she quickly clarifies and says it was not resolved because she still feels the tightness at the top of her body. She doesn't know if this has to do with the COVID vaccine and she has never had this before. Patient had people in the medical field that support her but they haven't yet heard of this gastrointestinal (GI) type of disturbance with the COVID vaccine. The vehicle that it was injected through, like how it was getting into the body, doesn't go through the body like that. Patient doesn't know if maybe it has turned her gut flora and something has happened. She doesn't know if it was something that she ate or a combination of things. All she was saying that it has been exactly a week today of just pain and burning and pinching. Patient spoke with her doctor who put her on an acid reducer because he thinks that it was possible that this was all from something that she ate and hopefully that will give relief to her. She was anti-medication. Her resting heart rate was up to 106 to 107 and she had that last night too like she said and this was after it had already went away for 2 to 3 days but then last night she had it again. Last night it was beating but it was not like too quick. Patient thought, what's going on because her heart was beating so hard but it was not around 106, it was more around 82 or something like that. She was laying down and it was not like she was running or doing anything. Outcome of events was not recovered.   The lot number for the vaccine, [BNT162B2], was not provided and will be re-quested during follow up.