I’m really sorry you’re going thru this.
I don’t know if this helps but maybe there is a different way to relieve the pressure? Like a healthier way to deal with it, you don’t have to resort to hurting yourself… The things which came to mind were running, or cold water swimming.
Running may sound like a horrible suggestion but hear me out… If it’s that bad then it’s a way of giving yourself “punishment” which it sounds like you are thinking about. I’m no runner, my lungs burn and my legs ache, I look like a bag of spanners but it can release some pressure, it doesn’t have to be long, just set off with some music on headphones and shoes and switch back and forth from walking.
Cold water swim has a similar effect, releasing pressure… I love the challenge of getting in, of trying to control breathing… Can you try either of these things?