Is it possible to find a doctor who is willing and capable of treating lupus, fybromyalgia, osteo and rheumatoid arthritis?

Rheumatologist : A rheumatologist should be able to help with each and all of this entities.

Yes: Rheumatologist specialize in treatment of systemic musculoskeletal disorders such as those you have listed. A rheumatologist would therefore be a great first option. Unfortunately it is often difficult to get an appointment with someone in this speciality. Your primary care physician if interested may be well equipped to handle your treatment with consultation with a specialist if needed.