To get rid of that depression and restore better brain function, there are several things you can do.
Omega-
3 sources come from fish like salmon, scallops, shrimp and scallops, by eating those a couple times a week, it will help your overall brain functioning picture, or if you're a vegetarian, flax seeds do the same thing. Eating eggs is also a very good protein source, about three times a week. Also, you need to be taking a B-complex and C vitamin three times a week.