Cymbalta and thyroid medicine

I am a 36 year old female who has been taking Cymbalta for almost a month now. I currently take 30 mg once per day, in the morning. Here's my story: For the past two years, I have been living with chronic pain, mostly in my back. I've also not slept well either. I could never get comfortable enough to fall asleep and if I did fall asleep, I'd wake up in pain. My Doctor has put me through numerous tests. I have finally got my thyroid medicine regulated and I've tested negative for Rheumatoid Arthritis and Lupus. So, my Doctor wanted me to try Cymbalta. She said that it was originally an antidepressant, which we know I don't need, but she said it has been successful in helping patients with Fibromyalgia. I was very skeptical about taking it, especially after reading the blogs on ****** about it. I spoke with a coworker who is on it and she said it has helped her tremendously. She had severe migraines. Well, I tried it, and in only a few days I felt a lot of relief from my pain. It didn't make it go away 100%, but I would say it helps a good 80%. That is so much more manageable than without it. I've only been taking it for about 3 weeks. I have a follow up appointment with my doctor next week. I have a feeling that she will put me on it twice per day though. It helps a lot during the day, but I think it wears off before bedtime. However, I have been sleeping much better since I've been on it. I don't think it makes me any sleepier during the day. But, I've been living with fatigue for a while now!