I'm more familiar with the post exertional stuff. Only had some relatively short lived mast cell/histamine stuff but it was rotten. I posted a reply with a link that might help. Hope you can also get some progress with the post exertional stuff. That's the big problem though!

Also great you got some real help from your LC specialist 🤘🏻

Yes, I had a look thanks! I think I'm getting the post-exertional stuff under control, I used to be a fairly keen runner (30k per week) and so after COVID I kept trying to get back to that and kept going down hill.