bloody diarrhea; I thought like I was dying; felt a shooting pain across the chest and then went to above my left eye; felt a shooting pain across the chest and then went to above my left eye; It felt like a migraine; felt like a piercing pain on the back and side of my head; felt like a piercing pain on the back and side of my head; felt a numbness on my left arm and hand; It felt weird and I couldn't describe it, more like I felt with pressure and heaviness; It felt weird and I couldn't describe it, more like I felt with pressure and heaviness; I also felt bloating and severe cramping; I also felt bloating and severe cramping/severe abdominal cramping; tired/fatigue, major fatigue; weak; short of breath; diarrhea; I had burning in my stomach; nausea; This is a spontaneous report from a contactable Nurse (patient) reported for self. A female patient of an unspecified age received the first dose of bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE), Batch/lot number: EL0142, via an unspecified route of administration on 11Jan2021 at single dose for COVID-19 immunisation. The patient's medical history and concomitant medications were not reported. Patient received the 1st dose on 11Jan2021 and she felt normal and had no underlying conditions. After the shot she instantaneously felt a shooting pain across the chest and then went to above her left eye. It felt like a migraine and felt like a piercing pain on the back and side of her head hours later and was intermittent for a couple of days. It became an intermittent headache for 2 weeks. She also instantaneously within a few minutes felt a numbness on her left arm and hand. It felt weird and she couldn't describe it, more like she felt with pressure and heaviness which lasted for 2 days. Later that night she also felt bloating and severe cramping that was so severe she couldn't walk for 4 days and come and go intermittently. She was rolling over her bed in pain. She was so tired, weak, and short of breath she couldn't do anything. She also had about 10 episodes of diarrhea with 3 of them being bloody diarrhea over the weekend, the last episode of bloody diarrhea was on the 18th, after which her stool was clear, normal looking. She couldn't eat anything because of this. No one in her facility that she knew of had similar side effects as her. She was terrified and very very afraid. She was also frustrated because she was not sure if it was the vaccine or not. This week she was just starting to get back to normal and feel better. She consulted with HCPs and did tests like Complete blood count, stool sample, abdominal X-ray, and COVID tests that all came back normal. She was still on the fence on whether or not she could get the 2nd dose because she came in there normal and came back like heck afterward. Patient stated she was a little concerned about whether or not she should get the second vaccine based on the symptoms she had from the first one. Patient further stated the first time she had the shot, she experienced the side effects. It started off with shooting pain across her chest and then pain in her head and then she had bloatedness with a little bit of nausea and then she had burning in her stomach. Patient stated, actually, she had more bloatedness in the stomach, more than nausea it was more like she was very bloated and that lasted for about two weeks. And she also had pain, as soon as she gave her injection, she had pain all across her chest and then she had a instant headache. She also ended up having bloody diarrhea. She had several tests afterwards from her doctor to figure out other possible causes, they did culture and they took her lab and they did an membrane X-ray of her abdomen and everything came back normal and fine and she felt totally fine until she had the shot and then all of a sudden everything fell apart and she felt terrible for two weeks. She had severe abdominal cramping, She thought like she was dying and fatigue, major fatigue. But she had one more question, she was wondering if anyone else has had similar experiences after this vaccine. Patient wanted to know if she should get the second vaccine. After receiving the first Covid vaccine she experienced pain across her chest and severe pain on left side of head. She wondered if the vaccinator had hit a nerve when injecting the vaccine. She then began to experience bloating, cramping, bloody diarrhea and severe fatigue, which lasted for about 2 weeks. She underwent testing by having stool samples and X-rays, but all tests came back negative. About treatment, patient stated, yes and she also have severe abdominal cramping. The outcome of the events was unknown. The reporting nurse (patient) considered the events Shooting pain across my chest, Headache, Bloatedness; I had more bloatedness in the stomach; Burning in my stomach, Nausea, Bloody diarrhea, Severe abdominal cramping, Fatigue, were related to COVID-19 vaccine.; Sender's Comments: A possible contributory effect of suspect BNT162B2 on reported events cannot be excluded.  The impact of this report on the benefit/risk profile of the Pfizer product is evaluated as part of Pfizer procedures for safety evaluation, including the review and analysis of aggregate data for adverse events. Any safety concern identified as part of this review, as well as any appropriate action in response, will be promptly notified to regulatory authorities, Ethics Committees, and Investigators, as appropriate.