trouble eating; feeling pretty unwell; fatigue; difficulty breathing; heart racing / her chest was pounding; nausea; Horrible headache; arm pain (left) due to injection site.; arm pain (left) due to injection site / She couldn't life her arm over her ears.; Her joints were hurting in her hands, jaw, and ankles.; pretty sick; This is a spontaneous report from a contactable consumer (patient). A 66-year-old female patient received bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, formulation: solution for injection, Lot number: EW0172) via an unspecified route of administration in left arm on 10Jun2021 at 12:21 (age at vaccination 66-year-old) at single dose for covid-19 immunization. The patient's medical history was none. The patient's concomitant medications were not reported. Patient did not receive any other vaccines within 4 weeks prior to covid vaccine. The patient previously took flu shot for immunization and experienced arm pain and had a heavy arm feeling. Caller was a consumer (66 years old female) with question regarding second dose of Pfizer Covid-19 vaccine. She reported that after her first dose of the covid-19 vaccine (LOT# EW0172) on 10Jun 2021, she experienced untoward symptoms including horrible headache but she can't tell now if it was just allergies or residual on 10Jun2021, nausea on 10Jun2021 then things progressed, difficulty breathing and had to sit in the chair because her chest was pounding on 11Jun2021, fatigue on 11Jun2021, heart racing on 11Jun2021, trouble eating, had pretty heavy-duty arm pain that she couldn't life her arm over her ears (left) due to injection site on 10Jun2021 and joints were hurting in her hands, jaw, and ankles on 10Jun2021. She reported she was hesitant to receive the second dose of the vaccine. She states she read an article that said the Covid-19 vaccine was a super booster to creating antibodies and that was why she chosen to receive the vaccine in the first place because she did not want to receive it at all. She stated she does not want to be limited in her ability to move in society by only receiving one dose. She stated she did not want to keep putting herself on the line. She was getting older and can't bounce back like she used to. She asked that because she didn't die, her symptoms weren't severe. Her question was if she was still protected if she doesn't receive a second dose of the vaccine due to having antibodies already. Patient was taking Covid-19 Vaccine in order to see family members who are more senior. She contemplated going to the hospital. She just took Acetaminophen probably every 4 to 6 hours started 10Jun2021, (Thursday) night. She didn't go to the ER, but she was borderline doing that. She did start feeling better late Saturday. Caller stated that she was still taking costco brand extra strength acetaminophen,and was unable to find the lot number she just took acetaminophen probably every 4 to 6 hours started on 10Jun2021, (Thursday) night. She took more Acetaminophen and slept and on 13Jun2021, Sunday they both woke up feeling good. The patient underwent lab tests and procedures which included Covid-19 antibody test which was positive for antibodies. At the time of reporting, the outcome of events were unknown.