I don't think I'd go so far as to say you should be "worried" about this, but I do think you need to bring it to the attention of your doctor. In my humble opinion, it sounds like it could be a pinched nerve or a massive amount of stress. It could be your posture..........it could be a number of things, EXCEPT brain tumors, cancer, MS or insanity.
Relax. See your doctor.
Peace
Greenlydia