Get a copy of your records from your rheumy. You want to take them with you to your new doctor. They will see that your old rheumy believed you and what meds you have been given.
You can also start a journal and record the magnitude of your pain with doing things. There is a link on Fibro 101 that has a journal and also explanations of pain...one has faces and that helps! This will help you tell your doctor the amount of pain you are in.
I hope this helps you.
Sherrine