It could be too much caffeine. http://webctor.com/articles/health_effects_of_caffeine_infographic,2092,1.html In this article i read here that caffeine may have given you insomnia :) Hope this helps.
Please go to the Medical Articles Section. There you can find some interesting articles explaining the diference.
I can say, from what you write, that you do not have the typical symptoms of aspengera such as slurred speech, behavior and routine physical clumsiness. It follows that you are suffering from shyness. It might be worthwhile to go to therapy such as treatment of shyness.