Can you help diagnose my car problem?

The shimmy could be related the the wearing of the tire. Get a replacement tire matching your other 3 and have the new tire balanced and a total alignment.

An 1/8 or less of pad isn't very much. You should replace the brake pads (both sides since pads are sold in sets) and check your rotors for out-of-roundness or low spots.

Also, is the metal sound more noticeable in turns? If the sound gets louder during a quick left turn, it could be the passenger front wheel bearing. Best way to test for this is to drive an empty parking lot with the windows down and everything else off and do figure 8s. You dont have to be going very fast, but you cant be creeping either.

I hate having to answer questions like this, but I suppose it is a civic duty to inform the uninformed. First of all anytime a car makes a strange noise, you should have it looked at immediately by a competent mechanic. For your safety and mine. Secondly any car that will not go over 30 mph has a serious problem and should not be operated until repaired. Thirdly I have in my younger and stupider days, driven a blown engine with a rod through the pan 20 miles to get it home. You may be able to drive a seriously damaged car, but you are only making the problem worse. And finally, have a mechanic or even a friend who is mechanically inclined look at the car. You simply are shooting in the dark for a diagnosis here.

you had a bad tire, bubble, broken steel belt or whatever, and when it blew you probably bent the dust sheild inside the wheel. just a thin sheet metal cover on the inside of the hub that almost touches the break rotor. if it does touch, you get a scraping sound. easily bent back with a screw driver or other simple tool.

you need to change your brakes, and possibly the rotor before you cause major damage

need breaks and tire