I usually cannot get closure on a health anxiety flare up unless it is investigated and proved to be all ok.
This is the problem you need to address. This cycle isn’t managing your anxiety, it’s reinforcing and enabling it. It’s so easy to read about symptoms and think “oh fuck that’s what I have”, but actually as we are presumably not doctors, we don’t really have any idea! I read “lower back pain is a sign of metastatic breast cancer” and I’m like right that’s it, time to die... not ever understanding that it’s a very specific type of back pain which I do not have!
I have some health anxiety too, obviously. The book “overcoming health anxiety” is good! So is the Headspace app. You don’t have to clear your mind and meditate - the opposite, actually, it’s about just noting your thoughts so it’s helpful and also low effort 👌
What you need to work on is acceptance and I think things like reading that book and mindfulness will help. I also think you should ask to be referred for CBT as that will help you to examine and undo some of the thought cycles you are trapped in.
I find for me, keeping busy is the best thing. Your symptoms are all most likely caused by anxiety which does an absolute number on the body. I go through stages where I notice every little thing that’s wrong and could probably build a narrative around it but I can stop that most of the time. It doesn’t help that I actually do have a long term chronic pain issue, so I am in pain a lot of the time! 🤦♀️
Please read that book, I can’t recommend it enough. You have to take steps to help yourself and going to the GP to be checked again isn’t one of them.