i have been taking Zoloft 200mg per day for 8 years did well for managing my anxiety but my doctor started weaning me off Zoloft so I can take cymbalta for fibro now I am taking 100 mg of Zoloft and 30 mg of cymbalta is it normal to have severe insomnia and anxiety/ pain attacks at this point?? I think I might be going through withdrawals.. How long should I expect this to last?