After the first pfizer shot I did not feel any concerning side effects.  Just a sore arm. However two weeks after the first shot I experienced an entired day of "jitteryness" which was very unusal, but then it went away. After the second pfizer shot I had sore arm, fatigue, 99.0F temperature but that cleared up the following day. That night I had a strange sensation that the chest conjestion that I have had for the last few years mysteriously relaxing and going away never to return. I felt fantastic for two weeks but then the jittery feeling came back but this time it did not go away.   Over the next few days I experienced what I mistook to be hyperthyroid symptoms of increasing "jitteryness", tremor, tachycardia, heat intolerance, digestive upset, rapid weight loss, tinnitus and severe insomnia. 20210304 online doctor service,  Ordered blood tests that didn't show anything unusual.  Prescribed Propranalol to reduce high pulse. Propranalol reduced tachycardia and jitteryness but I continued to have worsening insomnia.  Mid March signed up with GP and had consulation.  20210323 Propranalol started having reduced effect on pulse, worsening insomnia and increasingly desperate I checked into ER hoping to be admitted to hospital to have observation, diagnosis and effective treatment. Blood tests showed low sodium and low chloride.  ER Doctor diagnozed anxiety attack.  Given a shot of Lorazepam, prescription for hydroxyzine HCL and sent home.  Slept ok that night and felt ok the next day until the Lorazepam shot wore off. That night I took one tablet of hydroxyzine HCL before bed and woke up suddenly in an absolute panic feeling suffocated while having a nightmare.  Never took hydroxyzine HCL again. I continued to rapidly worsen over the next few days with increasing distress and symptoms taking time off work.  I could not sleep at all in bed anymore, instead dozing in living room recliner.   20210327 I accidentally fell asleep while wearing my new PulseOx ring.  It woke me up vibrating and the data showed multiple SpO2% drops down to as low as 76%.  Finally I had an answer. 20210328 Asked for and recieved CPAP prescription from PCP for obstructive sleep apnea.  While waiting for the CPAP one night I experienced as many as 55 drops to as low as SPO2 75% in a single hour. 20210329 By the time I had my complete set of labs and tests at PCP done I was in rough shape but hung on since I had hope of treatment. 20210330 Started on CPAP with improving sleep and O2 levels over the following week.  AHI on CPAP reduced from a high of 17.15 down to 5.  Early in April I reviewed my tests with and he said I was in excellent health except for being deficient in vitamin D3 (18ng/ml).   202104-202108 Over the following months I have continued to experience symptoms of jitteryness, tachycardia, fatigue, tinnitus and sleep maintenance insomnia.  Symptoms are improving slowly as the months go by.     This ordeal has been severely upsetting, financially exhausting and very troubling due to lack of effective medical help in the early stages of my distress. My current perspective on what happened is that my immune system response to the vaccine somehow triggered a cascade of symptoms stemming from sudden sleep disturbance.