Roofus - I know we discussed this over lunch today, but I'm going to reiterate what I shared with you. Go see Margo - I trust her implicitly. You can even discuss the herbal with her. I do believe it is more than depression, for me it is also the anxiety and other "mind fuck" exercises that come from the flashbacks. If you truly trust your T (and I know you do) take his advice and make an appt. with Margo. Talking to her does not commit you to doing anything, but I think you'll be glad you did once you meet her.
By the way, congratulations on earning your PHD -- DOCTOR NURSE!!