I decided I can’t do this job anymore so I gave my notice of resignation. Unless you really need to get back to the home country to fix anything, from what you

I decided I can’t do this job anymore so I gave my notice of resignation. Unless you really need to get back to the home country to fix anything, from what you've said, this is lose-lose for everyone. You probably spent a lot on your career so far and you will someday not want that investment to fall too hard. Remember they also spent a lot of time with you probably already, and there's a training cost invested in you personally. It seems in everyone's interest to get you back in the zone. If you don't get the edge back, your employer gets nothing, so it's not like you're trying to force them or anything. Establish that that is the situation, and given that situation, you need to be able to start from "hello world" at work. Get out of your expectations and it will be very easy to work yourself back in knowing that you're not under presser to be 100%. A very workable game plan is to start as if you are a new employee and work up one duty at a time. Get one side of the stress feedback loop broken and the other will dissipate on its own. You'll be happier when you're starting to work, start picking up duties etc because a career is an investment that has a future. I think when you feel the future seeping in, you'll find it easier than you expected to start getting back into the groove.