It's scientifically proven that if a person stops practicing aspects of education, such as math, science, etc., then after about 5 years, their IQ will start to drop.
Ever since I found that out, I was afraid that the same thing would happen to my drawing, but in a shorter amount of time and at a faster rate. D:

... I pretty good at freaking myself out.

i've practicing more shading and realistic portriats lately, which is all fine and dandy, except when i try to draw a body or i try to get my manga/anime style back...it looks like total crap

Not exactly, but I worry that I'll either go blind, lose my memory or be unable to use my hands, and not be able to draw because of it.

hmm this acually happened to me, now i suck at drawing

Yes and it's horrible