The doctors have told you right. You need quiet rest. An MRI or CT is going to be a waste of time and money. Anxiety is the worst for recovery.

If you broke your leg, you would have a cast and be on crutches for 6 weeks or more. Your brain needs the same treatment. It needs quiet rest. That does not mean sleep all day. Just, quiet rest. No loud music, bright lights, stimulating conversation, stimulating TV or videos, etc. In fact, talking with more than one person stresses the brain as it tries to switch between voices.

Get a deck of cards and play solitaire or a one on one card game with a friend. No computer or video games. Get away from noise, even the ambient sounds of suburbia. Foam ear plugs can be a big help.

Going back to the doctor and asking for help will be useless if they ask if you have been resting and you say no.

Eventually, if you do not get the rest you need to recover, you will mess up at work and they may give you unlimited time off with a pink slip of paper.

Quiet rest, and then more quiet rest. Go fishing if you can. Sitting on the bank with a line in the water or casting and retrieving a lure is all the stimulation you need.