she thinks she broke the sweat/big sweat; couldn't eat anything/was not even eating; She had the chills; nausea; She had a terrible headache; Feeling freezing cold; she was going to faint; She thought she was losing her mind; slight pain in her arm/sore arm/sore spot; She feels weak, and is still weak; She couldn't walk; This is a spontaneous report from a contactable consumer (patient). A 73-years-old female patient received the first dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE) (lot number: EL1283) via an unspecified route of administration in the left arm on 10Jan2021 at single dose for COVID-19 immunization. There was no medical history. There were no concomitant medications. The patient had the first dose of the vaccine on 10Jan2021 and didn't have a reaction, but had a slight pain in her arm on 10Jan2021. Her sore arm started on 11Jan2021. There was a sore spot and when she would pick up her arm it was sore and achy. No pain, but sore and achy. It lasted for a day or two. She didn't have any symptoms until Saturday the 16Jan2021, this past Saturday she thought she was dying. She had chills, nausea, feeling freezing cold, and had a headache. She thought she was losing her mind. The headache just stopped today. She had the chills that would not stop and she thinks she broke the sweat on Sunday (17Jan2021). She had a little nausea and couldn't eat anything on 16Jan2021. She had a terrible headache, which just stopped about 2 hours ago. She stated she must have to take 10 Tylenol over the course of time, every 4 hours. On Saturday 16Jan2021 she was just laying on the floor in pain. She was not even eating, just drinking water. All of her symptoms stopped this morning around 5 AM (18Jan2021). She had a big sweat. She is unsure if she had a fever because she does not have a thermometer. She is unsure if she has recovered completely from these symptoms. She feels weak, and is still weak (on Jan2021). She cannot go out or get dressed or shower. She is not strong enough. She is just sitting up now, no longer laying in bed. She couldn't walk (on Jan2021) and was afraid she was going to faint on 16Jan2021. She can walk a little bit now and feels a little bit better. She has been out of it for three days, She hasn't felt good. She asked if side effects can appear 6 days later? Is this normal to have a reaction 1 week after getting it? She asked are the side effects worse after the second dose? She asked is this Covid or side effects, what are the COVID symptoms? She asked should she take the second one if she had these side effects? Caller clarifies this is the Pfizer COVID Vaccine. Whoever vaccinated her did not give her the paper about it afterwards. Her neighbor brought it to her cause they went together. She did not realize she could experience these things. She did not expect them a week after getting the vaccine. She thought she had COVID. She asks, "do you think I have COVID?" She is just now getting better and it has been 3 days of experiencing these symptoms. Should she get the second vaccine? She is trying to do the right thing. Event outcome of chills, nausea, feeling freezing cold, and headache was recovered on 18Jan2021, for was going to faint and couldn't walk was recovering, for weak was not recovered, while for others was unknown.