It would be advisable to get a check up.
The mind like any part of the body, if it's acting in a noticeably detrimental way having it looked over by an expert is a solid policy.
Why treat a part of yourself in lesser way than a car or a computer?
It could be something physical like a thyroid problem in which case a simple course of tablets might radically change your life for the better.
I still think you can get that computer fixed too :-)
Welcome back.