If you are willing to look beyond the flawed belief that brain chemicals cause BPD then you may find some real answers. The elephant in the living room is: if it is really a chemical imbalance, then why are their no blood tests to diagnose BPD or any other psychiatric issue?
However CT scans can tell from minor brain edemas what type of BPD you may have. But very few neurologists have this skill.
When I work with BPD, I don't work with the manic phase, it exists only to make up for the depressive phase. Get rid of the depression and the manic phase will dissipate on it's own.
BPD has to do with deep subconscious emotional issues that have gone unresolved for long periods. Most often it deals with childhood issues of powerlessness, a sense of loss, lack of support and other issues.
These issues can be easily released and you be on your way back to a normal drug free life.
In addition Whipples disease has to do with a sense of devaluation which as you mentioned could be related to your BPD.