First things first, I personally do not suffer from either of the conditions you mention my knowledge comes second hand & from learning.
Second, you ask about natural things (gingko & ginseng) & whether they might help with depressive down cycles , I would suggest you looking into 5htp (refined tryptophan which when over stressed etc our bodies don't produce naturally)& sam-e.
third, I wasn't clear enough as to why I wanted you to check search engines re your symptoms & diagnoses; their are often alternative sites which show how some symptoms are misdiagnosed &/or alternative treatments for correct diagnoses & how they should/can be treated. This information is generally not available in books or libraries or in fact from doctors. In other words I suggest that you research information not put out by pharamceutical companies etc to ensure 1) that your diagnosis is accurate & 2) that you are getting the right & best treatments/medications.
fourth, removing yourself from people who have a negative influence on you is good, great in fact, but humans are social animals & as such we need social contact with other humans for our emotional & psychological well-being. Seclusion is something alot of people with mental well-being issues do but it is not healthy. So you need to find a new source of friends;
some suggestions as to how??
- does your college have any clubs &/or societies (like my daughters has 250+ of them from theatre to debating, political to towel fling & beard appreciation, greek to circus to sport) that you could look into & see if any of them are of interest to you?
- are there any local area groups that you might find interesting - historical societies, writers groups, craft, etc.
- join a gym & start an exercise routine; apart from possibly meeting people you may find the exercise helpful in terms of health.
- there are innumerable on-line chat sites for everything &. Anything including this one & also fan clubs & fan fiction writers re various shows eg. Csi. Getting social on-line may be a "safer" way to start till you feel more confident about your ability to choose non-destructive friends, of course this might also apply to people in certain of the above mentioned groups.
The

above are points for you to act on/look into.