I would reccomend

I think to be on the safe side that you get your thyroid checked out just to make sure GBS didn’t cause a problem there. Which is quite possible. But stress can cause problems too. The nail thinning is what has me reason to believe the thyroid might be acting up. It would pay to be safe than sorry by getting that checked out.
Sorry to hear about your girlfriend and the problems you had. That can trigger problems with your health too. But there will be other women in your life and the right one will come along and be much better!
I think one of the hardest things to do in life is trying to find our soul mate! Gosh is that a job! Not to mention the times you think you found them to end up getting heart broken which I have seen a few times in life! My husband and I will be going on 20 years soon. And we seem to be doing well together! If I were to lose him I would not want to start over again with the dating scene! For I don’t think I will find another one like him! Hugs
Linda H