I've been wondering the same about Cymbalta. I've had a hard spring and just saw my rheumatologist last week. I've been on Cymbalta 60 mg for about a year and frankly I didn't think it was any different than the last anti-depressant I had been on (Celexa).
When I told my doctor that my energy level was so low that some days I could barely get out of bed, my pain has been worse and it is a constant fight against the depression, he raised my dose of Cymbalta to 90mg in the am and this weekend it is to be increased to 120mg daily. Even the pharmacist was concerned about that dosage and called the doctor to clarify it.
I have to say that the increase in dosage has helped me alot. I do have more energy and am not nearly as depressed. But like you I am starting to have trouble sleeping and have not yet started on the 120mg. I'm hoping that it is a side effect that will resolve itself in time. I'm feeling better than I have in a long time! I do know one thing, this is a drug that you want to take early in the morning.
mother of four sons, grandma to five, wife to one wonderful husband
fibromyalgia since 1993
Cymbalta, Tramadol, Lyrica, Xanex
Love people and use things NOT love things and use people.
He is richest who is content with the least....Socrates