injection site pain for the next 2 to 3 days/arm was a little sore in the left; started feeling yucky around that time/I started feeling bad; my ailments that I already have are intensified; My acid reflux is horrible, unbearable; having ridiculous pain in my right arm, shoulder, and neck.; having ridiculous pain in my right arm, shoulder, and neck.; having ridiculous pain in my right arm, shoulder, and neck.; bothering me the most to the point of interrupting sleep; My appetite is zilch; her collar bones also had pain.; started feeling yucky around that time/I started feeling bad; This is a spontaneous report from a contactable other hcp (patient reported for herself) via medical information team. A 43-year-old female patient received first dose of bnt162b2 (COMIRNATY, Solution for Injection, Batch/Lot number was not reported), via an unspecified route of administration, administered in arm left on 10Aug2021 (at the age of 43-year-old) as dose 1, single for COVID-19 immunization. The patient medical history included fibromyalgia from an unknown date and unknown if ongoing. The patient's concomitant medications were not reported. On an unspecified date in Aug2021, the patient experienced injection site pain for the next 2 to 3 days/arm was a little sore in the left, started feeling yucky around that time/I started feeling bad, my ailments that I already have are intensified, my acid reflux is horrible, unbearable, having ridiculous pain in my right arm, shoulder, and neck, bothering me the most to the point of interrupting sleep, my appetite is zilch, her collar bones also had pain. Patient is seeking side effects of the Pfizer Covid-19 vaccine to compare notes with her side effects that she is experiencing. Patient is a (withheld) and is 43 years old, she is calling on behalf of herself. Patient stated that she received the first dose of the Pfizer Covid-19 vaccine on 10Aug2021. Patient stated she experienced injection site pain for the next 2 to 3 days, which went away very quickly just like the flu shot and anything else. Patient stated her arm was a little sore in the left. MI agent confirmed the left arm is where caller received the vaccine. Patient stated on 18Aug2021, she was called by 6-year old's school in which they stated he wasn't feeling well. Patient stated that she took her 6-year-old to the doctor in which they tested him for Covid and the results were negative. Patient stated she started feeling yucky around that time. On Thursday, I started feeling bad, like all of my ailments that I already have are intensified. My acid reflux is horrible, unbearable, and I'm having ridiculous pain in my right arm, shoulder, and neck. That is what's bothering me the most to the point of interrupting sleep. My appetite is zilch. Patient stated that she does have fibromyalgia and she is not sure if the reaction is related to the vaccine. Patient is wondering if this vaccine is like the flu shot how it makes some people feel yucky. I'm wondering if the vaccine hasn't triggered all of my ailments to flare up. Patient confirms information provided by the transferring agent but also adds that her collar bones also had pain. She is not saying the vaccine did anything, but she wanted to know does it intensify anything. The previous agent really didn't have much information for her. Patient stated that now is not a good time to do the safety report, caller asks if this agent can call her back or she herself can call back at another time. Caller was informed that reporter contact details would be verified as a means to follow up with her. Outcome of all the events was unknown.  The lot number for the vaccine, [BNT162B2], was not provided and will be requested during follow up.  Follow-up attempts are completed. No further information is expected.