This is a spontaneous report from a contactable consumer (patient). A 58-year-old female patient received bnt162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE, Lot Number: EW0171), via an unspecified route of administration on 28Apr2021 as 1st dose, single dose for COVID-19 immunization. Medical history included immune deficiency 2 months prior in 2021. The patient's concomitant medications include unspecified medications that the patient has been taking "forever". The patient did not start any new medications recently. She did not have any other vaccinations the same day as the Pfizer COVID-19 vaccine or in the four weeks prior. She says she hadn't had a vaccine in years. The patient reported that she got the vaccine then went grocery shopping and felt great, her arm didn't even hurt, and she didn't feel the shot going in. She says she went to bed and got up 4:00AM to get ready for work, and as soon as her alarm went off on 29Apr2021 she felt really weird. On 29Apr2021, she went to stand up and went to her knees since she couldn't walk and had to crawl to the bathroom. She was in the worst pain in her life/pretty bad pain. Her body was cramping. She was having cramps to her legs and just like every muscled from her foot to her hips and in her hips were cramping, severe cramping, the whole leg. She says she lost feeling and still has some numbness. Patient says her brain is a little foggy as well. The patient took pain medications and Neurontin which is helping her numb feet and tingling in extremities. She also had an icy feeling in her legs, though they are warm always although they feel icy, if she touches them they are warm, like normal body temperature. Patient clarified Neurontin as gabapentin 300 mg, says the doctor has started her out one at night before bed, and she just was given it, so she has only taken two days of it. She says they wanted to see how it affected her, and wanted her to call so they could decide how much to give her, so they started her at the lowest place. She says it didn't effect her worse than she already was, but she thinks they were holding off to see what the neurologist came up with too. The patient also had a little incontinence of bowel and bladder on an unspecified date in 2021. She says she went to the emergency room the day she woke up with the adverse reaction, on the "29th". She says that they gave her Morphine IV. She says that they did no tests, or blood tests, then they sent her home with pain meds and said that this will probably get worse before it gets better, and to follow up with her doctor. She says she followed up with her doctor the next morning. She says that the pain meds made her sleepy, but did not take care of the pain. She says that she went to see her doctor, who sent her to a different hospital, and there she was admit from emergency. She was given an unspecified muscle relaxer which was the one she threw out, her pain wasn't muscle, it was nerve, so she threw it out. She was given Hydrocodone, substituted for Norco. They also gave her, maybe a Tramadol pill, in the hospital. She says she spent 7 days in the hospital, had two ER visits, and doctor visits. The patient underwent lab tests and procedures which included antinuclear antibody: positive 2 months prior in 2021. The patient had her "proteins" tested which were good and also did a spinal tap and were still good in her fluid  both on an unspecified date in 2021. The other neurologist wanted to do an EMG (not yet done), because sometimes it can still be fine and not higher proteins. She says mostly they have been going by her symptoms. She has not been diagnosed yet with Guillain-Barre, since she still needs to see a neurologist for the conduction study. She added she will consult with her neurologist, continue to take her Neurontin, and have the physical therapy. The outcome of the events was unknown.