Loss of appetite; so scared, she doesn't know if she wants to do a second one.; lymph nodes are swollen; nerve sensitivity; almost like intramuscular pain in middle of my back to the bottom/pain from there to my hip to my seat; back pain; feeling like a issue trying to walk; pressure in chest intense/radiating between shoulder blades to stomach and down to back/feels like someone sitting on chest; ache in her chest; It felt like a flair up of her GERD; Chills; Shakes; Arm was Sore; Weak/legs felt like they were going to give out; felt dizzy; This is a spontaneous report from a contactable consumer or other non HCP (patient).   A 41-year-old female patient received BNT162B2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE; Lot Number: FF2587) Dose 1 via an unspecified route of administration, administered in the left arm on 15Sep2021 at 19:00 (at the age of 41-years-old) as a single dose for COVID-19 immunisation. Medical history included ongoing gastrooesophageal reflux disease (GERD), ear infection from Aug2021 to an unknown date , pharyngeal swelling from Aug2021 to an unknown date.  No concomitant drug was reported. The patient did not receive any other vaccines within four weeks prior to the vaccination. The patient experienced weak/legs felt like they were going to give out on 15Sep2021 with outcome of recovered on 16Sep2021, felt dizzy on 15Sep2021 with outcome of recovered on 16Sep2021, ache in her chest on 16Sep2021 with outcome of not recovered, pressure in chest intense/radiating between shoulder blades to stomach and down to back/feels like someone sitting on chest on 19Sep2021 with outcome of not recovered, felt like flare up of GERD on 16Sep2021 with outcome of not recovered, chills on 15Sep2021 with outcome of recovered on 16Sep2021, shakes on 15Sep2021 with outcome of recovered on 16Sep2021, arm was sore on 15Sep2021 with outcome of recovered on 16Sep2021, loss of appetite on an unspecified date with outcome of not recovered, so scared, she does not know if she wants to do a second one on an unspecified date with outcome of unknown, lymph nodes are swollen on an unspecified date with outcome of unknown, nerve sensitivity on an unspecified date with outcome of unknown, almost like intramuscular pain in middle of my back to the bottom/pain from there to my hip to my seat on an unspecified date with outcome of unknown, and feeling like its an issue trying to walk on an unspecified date with outcome of unknown.  As reported: The patient received the first dose of BNT162B2 on Wednesday, 15Sep2021. Immediately after she felt dizzy and weak. They had to assist her to a seat after getting the vaccine because her legs felt like they were going to give out on her. They and her husband had to assist her up and she was still a little dizzy but by the time she got to the car she felt a little better. These symptoms have subsided. The patient stated she also had chills or shakes later on that day and her arm was sore but a day later those resolved. On 16Sep2021, she got an ache in her chest initially and then it developed into pressure after that. On 19Sep2021, it was a pressure in her chest that was very intense this morning. It felt like a flare up of GERD but is behaving differently. It is a pressure that is radiating between her shoulder blades to her stomach and down to her back. It feels like the pressure is compressed. The patient stated the pressure and pain is scary. It feels like someone is sitting on her chest and it is and caving in on her. The patient stated she is so scared, she doesn't know if she wants to do a second one (vaccine dose). After 2 days, the chest pressure it seems to have taken somewhat of a break.  She knows her body is behaving differently. On Day 9, the patient reported she had gone to Emergency Room already and they checked the Domain-Dimer (D-Dimer) test that was negative and a troponin test in the chest, "but now I'm having almost like intramuscular pain in the middle of my back and it goes to the bottom, and then it feels like my chest still is crushing, and feels like the touch and stuff like if I run a towel down because my lymph nodes are swollen, and I run a towel and then I squeezed it out and then I put it over there is like I have a nerve sensitivity going on or something there. But today I started to have a pain from there to my hip to my seat, so feeling like its an issue trying to walk around. I reach out because I would think by now I'm much better but I'm not better. It's very intense, the back pain. I'm concerned because it seems like it's more on the nerve side of the pain. If I put a towel on my chest there's sensitivity even through the towel and I am getting that pain in there and it radiates down my hip and then my seat. The patient stated she is so scared, she doesn't know if she wants to do a second one (vaccine dose). The patient stated she has loss of appetite, but she is still trying to drink. Treatment for the event included esomeprazole sodium (NEXIUM), simethicone (GAS-X), and burping.