well. i might not be much of a help really, but i had terrible anxiety at one point and after a while the doctor had me on meds which made it worse. So i started self medicating myself with energy drinks and lots of caffeine to force anxiety upon myself, after about a week or so forcing anxiety upon myself with lots of caffeine and energy it went away. So maybe that can help, fighting fire with fire. Although if he drinks/eats alot of sugar or it is caffeine that is causing he should not drink caffeine or consume high amounts of sugars. My friend had that problem the reason he had anxiety and that worked for him. Well hope i helped a bit =\ good luck and cya