Sam,
Your determination is a big plus. The fact that you are not/will not give up until you get answers. Time is on your side. This might actually take a group of doctors working together with you; starting from the very beginning to the present.

Glad you are willing to try the Lexapro. As Kay mentioned; your dosage may need adjustment.

Your patience is admirable. You may be actually helping others not give up on themselves.

Gerry