Def get a wrap/support for it – whenever mine flares up (on a fairly regular basis) i use it. I have two – one for normal day to day stuff, and another for exercise. They are something like £12 from boots and i had an instant improvement in the swelling. I found after a couple of months i could exercise by adapting my grip on the bike/weights, but changing gear with fingers/knuckles took a bit of getting used to, so only pootled around cycle paths.
The gritty feeling is horrible and hearing it is even worse, i can still hear mine grind even when its “good”. A low point was sitting down to eat eggs on toast (not exactly hard to cut) and having to get my ex to cut it up for me.
Three years is a long time to suffer – i’m about 10months now, and mainly seems to go carrying heavy things, or whenever i’m stressed/upset.