Thirty years ago I suffered an anaphylactic shock. It was fairly mild as I didn't lose consciousness but I came close. I was rushed to the nearest hospital where a quick check found that my blood pressure was dangerously low. I was given cetirizine hydrochloride to combat the allergic reaction.
I don't know for certain what caused the sudden attack but I suspect that one of my work colleagues put something in my drink.
Anyway, I recovered within minutes but six months later all my hair follicles were dead. My hair was falling out in clumps. I lost every hair on my body and my fingernails were cracking. A consultant told me that I was lucky because an anaphylactic shock such as I'd experienced can cause the autoimmune system to attack anything or everything. For me, it chose the keratin-producing cells. But it could have attacked the pancreas (type 1 diabetes), the myelin sheath around nerves (multiple sclerosis), the heart valves or many other things.
So, a warning: having a "faint" after an injection might sound like nothing but it could be life-changing.
(Feel free to re-post this on social media.)
I had the 'rona pretty badly in around March 2020. the interesting this is that I am 45-50 and have thinning hair and male pattern baldness. As soon as I got better I had stubble on my head in the widow's peak area where I had gone bald. That hair has now grown back thinly, it's at about about 20% density and not very visible.
It happened suddenly after I got ill and my conclusion was that my testosterone levels had dropped because the 'rona had attacked my testes. I did notice a reduction in normal drive. I think the drop in testosterone may have reversed the area of baldness. The spike proteins seem to do all sorts of damage.
It could possibly have been the extra zinc I take though, it does support hair growth.
^^^ Likewise. I started to grow fuzz on my head after the 'rona and I'd started taking zinc not long before that. Zinc seems to be key.