If you have extreme uneven wear from one side to the other on the same axle, most likely you have a sticking caliper. This will effectively keep the brakes applied on that wheel even when you let off the brake pedal, causing the pad to wear extremely quickly. This is your number one problem, replace the caliper and for the love of God get a new set of pads to replace the ones you installed broken. Also for the record, the sticking in the caliper can be caused by a bad piston in the caliper body or bad slides in the caliper bracket. The remanufactured calipers you can buy at autozone DO NOT include the bracket, so you'll have to reuse your old one and therefore have a 50/50 shot of that new caliper fixing the problem. Best way to go is to get a new OEM caliper assembly, which includes the bracket and slides, from a dealership website. Dealerships basically give their parts away online for a small percentage above cost, much better than buying them over the counter. (Unless of course you live in Springfield MO, then come buy them from me
) Once you've gotten all of that replaced, take it for a drive and see if you still have weird sounds and vibrations.