Just to add to kel's sound advice, i have experienced exactly what you've just described. And i found that my Estrogen levels were too high and effecting my erections, libido, and mood.

Once i had them under control, my morning wood returned immediately and i felt better. So i believe that you are correct in your assumptions. However, as Kel has suggested, try to work through it until your next set of bloods. Tampering with your endocrine system now may only serve to complicate things since you're being cared for by a doctor who seems to be interested in finding a solution and getting you on the right track.

Good luck Strat, and please keep us posted with your upcoming results.