Fibromyalgia diagnosis

I saw a new rheumy last week. He feels that I was misdiagnosed and don't have RA. He thinks I have Fibromyalgia. So, he took me off of Celebrex and Tramadol and put me on Cymbalta. He wants me to give it a month before I decide if it's working for me or not. I feel about like I do most days, some aches and pains all over, but nothing unmaneageable. I don't know if that means it's working and I'd feel worse without it or if it's not working and that's why I feel pretty much like I do every day. Time will tell.