And yes, I know immunity doesn’t drop off immediately but I’m allowed to be concerned about waning protection. Covid is largely governed by human behaviour and for the most part we suck.
I know how you feel and sending you warm thoughts. I'm investigating the likelihood of MCAS (which I think to be high). I managed to avoid one case of symptomatic Covid (my partner). He isolated in the bedroom.
I have pretty much cut myself off from the world since everything began (and I'm lucky that I can), but my kid brought it home from school. And it's likely to happen again and again.
Sorry! My first reply was so lacking!
I avoided the first round (when my partner came home infected), but not the second round (when my kid came home infected). I'm currently recovering from an infection that started last week. Which came from school via my child. Still testing positive, still some symptoms nearly 10 days later.
I really worry about the same - we know little about the long-term consequences of infection.
What we do know is that repeated infections, which are going to happen given the virus' continued circulation and awful public health policy, seem to do our bodies greater progressive damage.
There also seems to be a mechanistic link between long COVID and MCAS. Several doctors with experience treating MCAS are now also treating long COVID patients.

No need to apologize about the info dump. Sending you warm thoughts.
Dealing with chronic issues is so frustrating. I grew up in the US, and my parents were particularly attentive to me and my siblings. Except my brother, who had really major medical issues. I think that was so much to deal with, there wasn't energy left over for me and my sister.
You might consider looking more into MCAS. It also exists on a spectrum on severity. Have you been evaluated for EDS? The sensitivity to bruising could be indicative of that. Furthermore, MCAS and EDS often co-occur.
Here's a link to a video that I found useful by a main doctor in the field. In short, when there's a multisystemic reaction (definitely true for you), it is worth considering MCAS.
And the sensitivity to water is something that I've read about before. Also people being sensitive to hormones, like those in birth control pills.
It is also interesting that you mention intermittent fasting. That's the same solution that I arrived at to deal with digestive issues. I'm also taking antihistamines regularly, which has helped a bit.
I always wear my mask when dealing with dust. That's the one of the "true" allergies I tested positive for - dust mites. We also use a robot vacuum!
The allergist started by doing blood tests, which looked for IgE-mediated responses to a variety of common triggers. My only such allergies were to dust mites and animal hair. Nothing food related. She would have done the scratch test to confirm anything that came up in the blood test.
For the longest time I’ve kept stuff to myself because I didn’t want people to get the wrong idea about vaccines. Also I grew up minimising because mum had too much to deal with. Mum is a hard one. Lots of physical and emotional abuse that she passed to me as well as physical problems so I’ve never had family. But I’ve been very lucky to find my cats, partner and a great boss. My fiancé’s family welcomes me ❤️