I Am Taking Cymbalta And Doxipin, One For Fibromyalgia, And

I am taking Cymbalta and Doxipin, one for fibromyalgia, and the other for sleep, I know they both have antidpressant properties. I have been thru many antidepressants since 1989,starting with the trycyclics, before Prozac hit the market, than on that, and every one since then. I am stable now however I am still pretty much very blue, and lack interest, and don't want to do much, have low energy, but just substain. Should I ask my MD for another antidepressant along with the ones I take? The cymbalta is a miracle for my fibro-amd the Doxipin is great for my insomnia. What should I do and which one would you recemmond if any? The cymbalta mg. is 90mg. a day, and Doxipin is 200-300 hs. Thank you. Diana