Rapid breathing, breathing really fast; Shakiness; Rapid heart beat; Light headed; Feeling weak; She also developed rash on her chest right between the breast and her bra line.; She felt her skin was prickly; This is a spontaneous report from a contactable consumer (patient).   A 68-year-old received BNT162B2 (COMIRANTY; Formulation: Solution for injection; Lot number: was not reported, Expiration date: was not reported, Age at vaccination: 68-year-old) via an unspecified route of administration on an unspecified date in Feb2021 as dose 1, single for COVID-19 immunization. Medical history included crest, has been diagnosed with this for 4-5 years. The patient's concomitant medications was not reported. On an unspecified date in Feb2021, patient developed rapid heart rate, rapid breathing, light-headedness, shakiness, and feeling weak after 6-7 minutes. She also developed rash on her chest right between the breast and her bra line. The rash developed in the evening when she felt her skin was prickly. She said that it lasted for a few minutes then it went away. She wanted to know if she should take the second dose and if she would experience the same reaction after the second dose. Upon follow-up, patient reported She had the first one, she can't remember the date it was written down somewhere but her second dose was a 3 week period and it is supposed to be 15 of this month. she experienced rapid heart beat, breathing really fast as if she were taking a really fast walk, she got light headed and a couple of them fall under the severe allergic reaction and she wants to know if she can expect the same for the second dose or worse or should she even take the second dose. Anything about medical history she can provide over the phone because she does have some medical issues that she has been having to deal with over the years. She stated that she is not sure of the date of the first dose but if you count back from the 15Mar it was going to be exactly the 3 week mark so it was sometime at the end of Feb. She does not think any medicine is relevant because her medication she only takes one and she has taken that for years so no medication would be relevant that she can think of at all. Her primary doctor is aware of her autoimmune disease that she has been dealing with for the past 4-5 years its called Crest, like the toothpaste, She was diagnosed with it 4-5 years ago.  Description of complaint: Caller reporting her experience with the Pfizer COVID 19 vaccine. She says she asked the girl who gave it if the dose was given by weight and she told her no it is a one size fits all. No further information provided. She asks why is it given in 2 doses instead of 1? Caller says she does not have her vaccination record card with her to provide NDC lot expiration for the first dose of the COVID 19 vaccine. The outcome of all events was unknown except not recovered for prickly heat on an unspecified date on Feb2021.     Follow-up (02Mar2021): New follow-up information received from a contactable consumer (patient) included: event information, medical history information added.   No follow up attempts are possible. Information about lot/batch number cannot be requested.