Hello So leigheas: The Skeezyks has pretty-much the same situation you do... except that I've now aged into my retirement years. I've never been diagnosed as having PRSD. (Actually I've never been given a diagnosis, period.) But I think I pretty-much have all the symptoms whether one wants to call it PTSD or something else.
I hate to be the harbinger of bad news here. But if my experience is any indication (maybe it is... maybe it isn't) I would have to say the likelihood is you'll be dealing with your PTSD in one way or another for your entire lifetime. At least this has been the case for me. My symptoms have waxed-&-waned over time, depending on what else was going on in my life. But they've always been there to one extent or another.
I never understood what was going on with me & how much of an impact it would have on my life. I kept trying to force myself to do things I simply wasn't psychologically capable of. This was particularly the case with regard to employment. I pursed employment situations that required a lot of public contact, when I HATED public contact & absolutely lacked the ability to handle it. I thought that if I just kept pounding away at it, eventually I'd adjust. I never did. Consequently, I was miserable most of the time & I seldom produced quality results.
So my advice for what it's worth (perhaps not much) is to take an honest look at what you are & aren't able to handle & try to organize your life (vocational & otherwise) to suit the person you are. Do not, as I did, try to ignore your limitations, pretend they don't exist & just keep slogging on. I sincerely believe you can have a great life even with your PTSD! But you need to work within the limitations PTSD puts on you not struggle against it. I wish you well...