Hello and welcome to our family. As Tgal mentioned, sometimes finding the right combinations that treat our specific symptoms can take some time and experimentation. I am glad that you have a doctor who is doing all that he can to help you.
It is quite common for those suffering from any auto-immune/connective tissue disease to also develop other auto-immune/connective tissue disease. I think that most of us have more than one overlapping illness occurring simultaneously. I have Lupus, Fibromyalgia, Raynaud's, and a few others. So, don't let this aspect of your illness frighten you too much. You are very lucky that your doctor understands this and is willing to try to treat you if you do have overlapping issues.
We are here to help you as much as we can...I am glad that you joined our family!
Peace and Blessings
Look For The Good and Praise It!