FYI, I have seen a rear end destroyed in as little as 500 miles! 6 months is more than enough time to destroy the rear wheel/hub/splines etc. if you didn't have moly paste on the splines, and follow the proper service directions.
Its also quite common for the owner to not be aware of the bike getting worse over a period of time. I have opened up rear wheels for members that swore up and down that they bike is perfect, to find an empty cage where their flange bearings once were, wheel bearings grinding like a coffee grinder. I guess some folks just get used to it.
Other folks, like me, OCD King, can tell just rolling my bike backwards if the tire pressure is a few pounds low, or the brakes have air in the system, etc.
Wish you lived closer to me, I would inspect your bike from axle to axle and show you what was damaged/worn/or needed service repair....but then again, from the damage we've already seen in the pictures, I am not so sure you would want me to do that....I am sorry you are having these issues with your bike, but at least you made it home safe, and were not involved in an accident or such.
Due to the year of the bike, and the issues that you've already found, I am afraid that you would be throwing good money after bad if you tried to restore it to serviceable condition.
YMMV.