tightness under the right breast area/it was mild spasming/spasm feeling under right breast area; felt wobbly; dizzy/lightheaded; anxious; feeling funny; acid reflux/had a flare up of gastrointestinal system; acid reflux/had a flare up of gastrointestinal system; wave go across her stomach/had a feeling like a wave across her stomach, like a shiver; night sweats; This is a spontaneous report from a contactable consumer (patient). A 69-year-old female patient received the first dose of BNT162B2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE; Lot Number: EN6200) via an unspecified route of administration, in the right arm on 27Feb2021 at 15:00 (at the age of 69-years-old) as a single dose for COVID-19 immunisation. Medical history included gastrooesophageal reflux disease from an unknown date and unknown if ongoing, breast cancer female diagnosed in 2001 (She had two other bouts. One was in 2009 and one was in 2015. She doesn't have breast cancer now), mastectomy on an unknown date, thyroid issues from an unknown date and unknown if ongoing (Her thyroid was burned out when she had radiation), and high blood pressure from an unknown date and unknown if ongoing. Concomitant medication(s) included metoprolol for hypertension from an unspecified start date and ongoing(been on it for years); amlodipine besilate (NORVASC) for hypertension from an unspecified start date and ongoing (been on it for years); levothyroxine sodium (SYNTHROID) for thyroid disorder from 2002 and ongoing; atorvastatin (LIPITOR) for blood cholesterol increased from an unspecified start date and ongoing. The patient had not received any other vaccines within 4 weeks prior to the COVID-19 vaccine. No additional vaccine(s) was administered on same date as BNT162B2. She has a history of acid reflux and "gastrointestinal whatever". On 27Feb2021, when she was sitting there for 15 minutes after the vaccine, she had a feeling like a wave across her stomach, like a shiver. The next morning, on 28Feb2021, when she got up she felt like she was in menopause again because she had night sweats. She is 69, about to be 70 years old. She felt wobbly and walked around for 4 hours. She felt tightness under the right breast area. It was a mild spasming. She was feeling funny, lightheaded, dizzy, and anxious. On 28Feb2021, the day after the vaccine she had an episode, or recurrence, with acid reflux and went to the emergency room for a wellness check to make sure it wasn't heart related. Everything with her heart checked out and they said it was gas. They gave her simethicone (GAS-X) and she was sent home. At the emergency room they also found that her red cell count was on the borderline range and that her body may have already been fighting the vaccine already. She was eating small meals and having problems. She went to her doctor because the gastrointestinal issues had continued who said she had a flare up of gastrointestinal system. Her doctor said to take omeprazole 20mg capsule once a day and take famotidine (PEPCID) 10 mg (Expiry: Oct2023/Lot number: SPF043) before bedtime. Her doctor gave her a diet and said to not eat after 7. She saw the doctor on 05Mar2021 and started omeprazole and famotidine that day.  The patient stated she is responding okay but still having occasional spasms. This maybe only occurs once a day. Her symptoms are manageable but she has a spasm feeling under right breast area.  She said it may be from her anxiety. It has been over 2 weeks and she is due for the second shot. She is looking for information that Pfizer has about this side effects and the second shot. What could she do to ward off anything? Should she take the second shot? People say the second is worse than the first and she is not fully recovered and due for the second one. The outcome of the events, acid reflux/had a flare up of gastrointestinal system, wave go across her stomach/had a feeling like a wave across her stomach, like a shiver, night sweats, tightness under the right breast area/it was mild spasming/spasm feeling under right breast area, felt wobbly, dizzy/lightheaded, anxious, and feeling funny was unknown.   Follow-up attempts are completed. No further information is expected.