First of all, I note that 82 people have looked at your post and haven't replied, so I wanted to break that trend. I also note that it's been a couple weeks since you posted this, and I hope you're okay! I understand how demoralizing it can be to call out for help like this and get nothing back. If you're like me though, you've been searching around on the forums and know that there are other people who feel and have felt this way and have been perfectly okay.
Now then, about how you feel and think, I'm having the exact same issue, right down to the solipsism. My problem is that the solipsism led to another issue. My first thought was, "What if everything around me is just a figment of my imagination?" Following that, for whatever reason, my mind came up with, "If all this isn't real, I can hurt people and it won't matter." Maybe it was something I read, saw, or heard. Anyway, this of course scared the hell out of me because I would never want to do that. So, you see, already we're sane because we have a rational part of our brain telling us that these thoughts are crazy. Even though I have this fear that everything around me isn't real, my rational brain is still in there somewhere. But with anxiety there's always the doubt, that niggling, "But what if you are insane?" that shows up. I too can feel better for a while if I get my mind off of it but it always comes back because of my fear that if I don't keep checking on it and monitoring it I will
go insane, or rather, that I will somehow lose control and hurt people, because as long as I'm in control I know I won't let myself hurt anyone.
And this is where health anxiety shows its OCD side. I've read several posts where people compare the two and even say they're connected and the two often show signs of each other, and this is exactly that. Ego-dystonic intrusive thoughts, obsessive thoughts, checking, anxiety, mind loops. Those are all very common in sufferers of OCD and health anxiety, so I too believe the two to be connected. In fact, I've come to think that since all anxiety disorders are connected, it's entirely possible for people to have little bits and pieces here and there of different anxiety disorders rolled together, so it's entirely possible for a GAD sufferer to have obsessive, intrusive thoughts like an OCD sufferer without having full-blown OCD.
So hopefully this brings you some comfort in your struggles, knowing that you're not alone. I don't know if you've had Harm OCD type issues like I've had but the fact that you've suffered with this for close to 5 months and are still here brings me some hope. I'm always here to talk to if you need somebody, just pm me. Hope to hear from you soon.