I have mixed moods and lately have been on the "roller coaster". It is frustrating. Now anxiety has crept on me too. You are right, it is not a simple matter when it comes to brain chemistry.

You may want to contact your local NAMI. They offer groups for family members to help them understand what you are suffering, and how to talk to you.

I had a very wise doctor tell me, "The only way out of the pain, is to go through the pain." Every time I sink low, I do eventually come out of it. Depression does not last. Be wary of the times you are manic, to prevent going to the extreme high and all that can happen.

In the mean time, keep coming back here. There are a lot of people feeling the way you do. We all support each other.