Hi Geralt of Rivia,
You are not alone in experiencing health anxiety; headaches, fatigue and high heart rate are absolutely connected with anxiety. Anxiety causes all sorts of symptoms, which is tricky because they can also mimic so many other conditions!
Highly encourage you to have a look around the forums, especially under this anxiety section because it's full of threads with people talking about their own experiences.
As for advice? Keep writing! It can take a little trial and error to find out what's going to work for you. Any sort of movement, any sort of creative outlet and any sort of support is also helpful. Totally happy to brainstorm some ideas (but I'm going to keep this post short since there is so many).
As for YT clips:
- Defeat negative thinking: An animation - Happify
- Passengers on a bus - An Acceptance and Commitment Therapy (ACT) metaphor - Joe Oliver
- Never Google your symptoms - Henrik Widegren (This gave me a good laugh as opposed to anything)
As for the calming videos, spoilt for choice on YT- nature clips, binaural beats, AMSR, oddly satisfying, psychedelic, sleep stories (Calm has a lot on their channel)..
I recommend Insight Timer as well. While you can pay, I just have the free version and there's so much there you can access depending on what you like/dislike.
Hope this gives you a place to start.