Hi there, do you think there's any possibility you may have OCD in addition to/instead of health anxiety? OCD is quite misunderstood by the general population, but a lot of what you've written (based on a fear of illness/contamination, exploring every possibility, being unsure of what you saw, questioning your memories) reminds me quite a lot of the way my OCD behaves. You don't need to have obvious, physical compulsions to have OCD, either. I would definitely encourage you to look into it, as I think OCD and generalised anxiety/health anxiety are often mixed up, and seeking reassurance for thoughts like these when once has OCD can do more harm than good, in the long run.

I hope I haven't hijacked your thread with this, but I'd encourage you to look into OCD a bit and see if any of it seems familiar. I'm also happy to chat about it a bit with you, if you'd like. All the best