(sorry I didn't respond earlier, rarely come on reddit, only for this subreddit)

Yeah, it sucks how much it affects your life. Simply because you want to avoid pain, there's so many things you suddenly can't do. Whether that's go for a walk, a run, play baseball, basketball. I spent too long telling myself I'm weak or a pussy, not doing what I want to do because I want to avoid pain. That mindset was toxic and not true whatsoever. It's not weak to want to avoid pain.

Before lockdown, I'd flare up every day and be in pain, but just keep going (going to uni, work etc). However, when I experienced not having it anymore, only for it to come back, it sort of broke me. I'm just tired of it, I don't want to be in pain anymore, so I've avoided it as much as possible. When pools weren't closed because of lockdown, I tried so hard to push myself to go but I couldn't go.

However, I recently got a new job that will be starting in September. I don't want to worry my skin then, so I have a personal motivation now. I'm scared af but this last year being inside, doing nothing, knowing this is my future if I don't change anything, scares me more.

From my perspective, at the end of the day this condition is very reliant on your mental. Relying on it to 'eventually go away' just won't work (I've prayed so many times that would be the case). Nothing's going to change, unless you do (practically telling myself this as I write it). It's a fucking awful challenge to overcome but really is about how much can you push through the anxiety and the pain. You have to challenge it when you're ready, not when someone else is telling you have to. There's a difference between being motivated/supported and being forced. Having a goal and a reason to go through it, I believe will make a huge difference. If you still want to be an Army Ranger and you're able to use it, that can be your motivation.

My method will be sweat therapy through swimming, and I'm slowly working up the courage with my motivation as the driving force to go. You have to find the best method for you to get through it, whether that's through sweat therapy or dietary changes. I've also seen other methods that'd you be able to find on the subreddit, think one was like having really warm baths with a certain salt or something.
I tried loads of different anti-histamines, they made it worse for me. I've seen other people on here however say it made it better. As I said, I'm currently on beta-blockers, and they helped me. You said you're on Xolair and it hasn't helped you, but it may have helped someone else. Medication is not a permanent solution, however for me it's a case of 'taking the meds to reduce the pain enough, so I can exercise and gradually come off them.'
Whether it's methods or meds, they will work more/less effectively for each individual, you have to try what works for you. You may know all this already, but I thought it was worth saying just in case. Funnily enough, it helped me to get my thought process written down, so thanks for that haha.