The cost is pretty high, but I feel the cost of me trying to deal with this myself in the long term is much, much higher
Yes.
I totally lost my **** back in 2021, literally came very close to just doing myself in.
For ages I thought I could deal with it myself, or it was just a "passing phase" or whatever, when I was gravely mistaken. I feel it's very much a "bloke" thing to do, keep kidding yourself it'll just go away, or "it's not that bad" when in reality it's gotten out of control.
I got professional help, and some medication and counseling and it worked very well, and that's the point where I realised just how much I did need the help.