I write you today regarding a severe reaction I had post first covid shot. I received my first Pfizer covid shot Sunday October 3rd at 4pm. Everything I was told to expect after this first shot was normal, some minor fatigue, headache, and slight arm pain at the source of the shot. However, roughly 29 and half hours later I suffered a severe reaction leaving me physically disabled for some time. Below I will explain the event in detail. At 9:40 pm Monday October 4th while in bed I suddenly became violently ill, within seconds of feeling ill. It was like turning on a light switch. Within seconds I had a weird sensation start from the back of my head, running down my back, and into my legs. At the same moment I developed goosebumps and the hair on my body stood tall and became increasingly cold like I was in hypothermic shock. I then began to violently shake throughout my whole body leaving me unable to move willingly for about 5 minutes. If I was standing at this moment in time I would have collapsed on the floor.  Leading up to this moment I had increasing pain in my left arm running down into my hand, at the peak of my violently shaking episode, which I believe is known as ?Rigors?, I had hard chest pains, shortness of breath, felt like I was going to faint, puke, and had tunnel vison. I felt like my world was closing in on me during this time. When I was able to function and move while still shaking roughly 5 minutes after the rigors started, I was able to put on my pulse ox and had a pulse rate of 125 BPM. I then proceeded to take a shower. Before the shower I took my temperature at it was at 99.9 degrees. After the long shower I went to my mother?s house just before 10:30pm almost an hour after my attack. We have a Kardia EKG device there which I used 3 times. I did 3 EKG?s while there and had an average heartbeat of 110 BPM and was in Tachycardia, which I know means my heart is over 100 BPM, but I mention this to show that after 40+ minutes I still had an elevated heart rate after hitting 125 BPM with my pulse ox. I can confidently assume that if I was able to take my pulse during my attack it would have been greater than 125 BPM. I also had a 101.2 fever at my mothers. I do not believe the rigors were brought on by this small fever, because I did not have a fever until the rigors were over. Due to these medical abnormalities I went to the emergency room where I was monitored from 11:23pm till roughly 5:30am.  Currently I still have tightness in my chest and have moments of small shooting pains in my chest at random times. Since this has happened, I went back0.  today (10-6-2021) to ask questions and report this medical event. The person there that administers the shots said I need to follow up with doctors and would not advise taking the second shot due to this reaction, and that yes reactions are common but mirror more like cold symptoms, and that the reaction I had is less common but is known.  On 10-8-2021 while getting ready for my CT scan when nurse injected me with saline solution in my right arm, same arm as the short, I had a crazy reaction to the saline solution making my arm super tight, caused my wrist to curl inwards and my fingers into a fist. The staff there when I asked if they have ever seen a reaction like this said no. They didn't panic but how no idea what to do. after about 5 minutes my arm returned to back to normal. I also want it to be known that I have already had covid, and tested positive 7-17-2021