Following my first Covid 19 Pfizer vaccine 03/11/21:  **Note, I went through 1 1/2  days dull ache in arm no concerns > days 2--5 went through a HYPER-WELL (no age aches, prior-hurt finger didn't ache, energy, ladies room habits back to what I reported to daughter "age 20!" for these four days, amazing, enjoyable, then > day 6 very early am woke up with swollen neck lymph nodes half-palm sized rocks on neck, breathing difficulties (lungs not neck), bad dull intrusive headache (different pain from Migraine, or low-hydration pain), cough dry and have called this my HYPER-CRASH because I could barely walk, backward C-shape abdomen hurt (dull ache big always + frequent stabbing pains from below bra bottom line to left abdomen down side then curving to my right across bottom abdomen at both leg-attaches-to-abdomen locations. Difficulty breathing, pain, extreme swelling over upper abdomen when I even drank water to swallow morning Hydrochlorothiazide pill and would stay swollen for 4-8 hours with continued surprise to me gulps of air throughout period, weak, nausea but not vomiting, dizzy, unable to walk more than a few steps at a time, fever taken and wavered from 95 to 99 degrees (my usual body registered 97.8 degrees) but never over 99 degrees, and only over 97.8 degrees perhaps three times very little above it and only for a few hours.  >>I went to Urgent Care in person no better at all on 3/24/21/roughly day 12 after vaccine shot 3/11/21 (Urgent Care) which took blood and urine tests determining roaring infection and blood in tests and a CT CONTRAST scan should be ordered by my PCP asap at appt PCP already scheduled 3/26/21 but she couldn't order CONTRAST version the PCP would need to and she prescribed three antibiotics to take over next 2 weeks >> I went to PCP 3/26/21/day 14 after vaccine shot and he ordered CT Scan but insurance required pre-auth and they refused it at first so PCP referred me to GI SPECIALIST who again referred me for CT CONTRAST test, which I did have on Friday afternoon 4/16/21 (Clinic), and I await the results today 4/19/21.  Today I continue to have pain abdomen, though softer and throbbing, same C-shaped region, HUGE issue even drinking water with Hydrochlorothiazide pill only for many hours as abdomen swells at bottom bra-line center in a palm size mound for hours, and back hurts badly, solid headache which may be only right side of head more than left but I am taking nothing for any symptoms afraid of GI issue.  NOTING AGAIN: Yes I was diagnosed roughly 2015 with a single incidence of diverticulitis/osis by GI SPECIALIST in Town and went through series of Colonoscopies and tests, but tests only determined incidental few polyps removed over all tests and no incidents at all since that. Knowing what I know of my body and health, the trigger seemed to be the first shot of Covid 19 Pfizer vaccination which remarkably seemed to react first with a few days of better health than I have had for decades (eating, moving, energy etc. for my age), where after days of extreme great health and energy (where I went nowhere, and still did not push myself much) my body then crashed to unable to move much or even breath normally for many days after and with a multi-level infection in my gut that needed three antibiotics and after those I still hurt in the same locations.  I cannot confidently rule out the Vaccine as the cause, and what I know of my body suggests in fact some "overdrive" function in my system was triggered and then caused the crash that resulted in infection and that continues to interfere with my walking, eating, moving, breathing, and even drinking a small glass of water today.  Final note: PCP confirmed I should take the second Vaccine Pfizer shot, which I did on 4/1/21 - same site, Lot #EW0150, after which second vaccine shot I had the same two days of dull arm pain, and I continued to finish the antibiotics until finished (but pain though softer continues to today).  I did not experience a #-Days HYPER-WELL episode then HYPER-CRASH after this second vaccine shot, only the arm ache, but throughout was still very unwell (breathing, pain, no activity, weak, unable to eat, swelling, headache, cough intermittent, back hurts, etc.) throughout, and same to this day 4/19/21 as I await CT CONTRAST results. I felt compelled to share I feel this was triggered by the first Vaccine shot, and would not have happened had I not had the Vaccine shot. Thank you.