Anyone taking Cymbalta? What are your thoughts?

I was put on Cymbalta because I have severe TMJ symptoms. I was on a soft diet for 5 weeks and still am and I am slowly getting better but was told I have arthritis in my jaw joints. So because I clench my teeth at night (due to anxiety apparently) I have Xanax I take when needed, but only use it a few days a week and only .5 mg. I am taking a muscle relaxer before bed and about 2 weeks ago started Cymbalta. I was told this treated osteoarthritis as well as anxiety. My insurance does not cover it so my doctor is having me try it out with samples. He wants me to see it through because he thinks it's the best thing for me. I got sick to my stomach on it the first week and then started taking it at night time and never got sick again. I am not feeling any different though, well, my jaw does feel somewhat better. Does anyone have any problems on this medicine with weight gain or loss? Do you feel it is helping you and if so, how? Why are you on it?