Starts making tin can dragging noise

The mechanics were freelance mechanics but one was at a certified national autoshop; I asked them to see why my check engine light was on and to fix it but two trips and hundreds of dollars later didn't diagnose the problem and my car started the dragging noises as soon as I left (feel like they exchanged my parts or something illegal since my mom took hers in at same time for noise and also left with a new check engine light signal on and the same new dragging noise), at that time my car never shut off before was just making noises and sometimes shook. The last mechanic did multiple things and just two days ago put a new battery in but I found out later it wasn't the problem since my car did same thing again. He said not to turn on the AC anytime soon.
Also my car has leaked a brown fluid and clear fluid, but when I had the mechanics check it a few months back at an oil and fluid change which came with a car check they didn't say anything about it so I didn't think anything of it.

Also, it starts to happen when drove a few miles and it seems like the engine overheats since when you open the hood after a shut down it smells like somethings burnt and chemicals and a little smoke. Also I remember last year anytime I would turn on AC the whole car would visibly vibrate enough so that I thought that the screws on the steering wheel would come off and it was hard to hold onto especially at a stop light. But I took it to a mechanic and he said just drive a thousand miles and it was just due to the new sepetin belt he put in (I already had one put in by another mechanic a week before that turned out to be faulty and scratched.) But it didn't go away so went to another mechanic for the vibration and he just flushed outsome things like the AC. But car still shook sometimes not as hard though.