Trying other ways to knit would be my first suggestion – and I see you're already working on that – but I would caution you against switching up a way of knitting in the middle of a project as you will likely suffer gauge shift.
I'm a continental knitter, so my pains are usually limited to thumb flexing muscles and the backs of my forearms. I had a massage therapist once who thought she would invent a sling for American style knitters, a place to rest elbows to relieve the stress on their shoulders. Do you knit with pillows about you for support? I know some people who do.
I get aches in my 53 year old hands a lot when I'm cramming to a deadline, and I have to knit through it, sadly. I take ibuprofen, stretch, and hope that the overnight non-knitting (also known as sleep) will be enough to stave off thunder knuckles. I do take days off when that happens, as soon as the knitting is completed. What I do on my days off is prepare for more knitting! I gaze at my queue, sort my stash, sketch, sometimes write patterns out. But it's all about pacing myself and remembering I'm not 24 anymore (!).