This is a spontaneous report from a contactable consumer (patient). A 57-year-old female patient received BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE), dose 1 via an unspecified route of administration, administered in Arm Left on 24Mar2021 10:45 (Lot Number: ER8733) as SINGLE DOSE for covid-19 immunisation. Prior Vaccinations within 4 weeks, no other vaccinations within four weeks prior to the first administration date of the suspect vaccine. Medical history included she was a breast cancer survivor, it's been 10 years, all she had was radiation and she also had Tamoxifen for 5 years. When she was young, she would get vaccines and would always get a light fever and her arm would swell and turn red. She verified she had this type of reaction with any vaccine she received. She also had a colonoscopy a couple of months ago. The patient's concomitant medications were not reported. She got a very bad headache on 02Apr2021, she woke up in the middle of the night and she got up, she thought her head was going to explode. She fainted on 03Apr2021 for just a few seconds, so she went to the emergency room on 03Apr2021 and they gave her a CAT scan, with dye and one without dye and everything was normal. They gave her some Advil through her IV to get rid of the headache and then she was okay. She said the night before she had a headache, she took a baby aspirin and she was better and went to sleep. Patient stated around 1 AM in the morning, she woke up and wasn't feeling well. She got up, she had a really bad headache, throbbing, seemed like it was going to explode, and she went to the bathroom. She called out to her sister, she was not feeling well and she lost consciousness there. A few hours later, her sister helped her to the living rom and she could not walk by herself, she was weak. She ate something later, she drank a lot of Gatorade and she got in touch with the nurse and the nurse told her to go to the emergency room they performed tests at the ER. She did not have any more headaches, the throbbing headache went away but the headache didn't completely go away. In the emergency room after all the testing, the doctor told her they were going to give her something similar to Advil through her IV and the headache went away. The fainting only happened that one time and ended right then and there, she thought because the headache was so bad. Patient reported her heart rate was very fast. She stated they waited for her heart rate to stabilize they gave her Advil through the IV, the headaches went away and she slept and they allowed her to go home once everything was okay. Between the first and second doses patient was sensitive to hot and cold foods, she couldn't drink a hot cup of coffee. She thought she had a cavity, it was strange. She was eating everything lukewarm. She felt sharp pain on her right side. So she went to the dentist and the dentist thought it was more of a vein problem, they took x-rays and found two cavities and a cracked tooth, and they fixed it. First Visit to emergency room, CAT scan with and without dye, COVID test, EKG, Lung X-ray. Everything came back normal, it was negative. Patient has recovered completely from the headache on 03Apr2021 thanks to the Advil. She confirmed she recovered completely from the fainting on 03Apr2021. The outcome of other events was unknown.