Tara, Behcet's really does fit. I would print out all the information on the Mayo Clinic site about
Behcet's and bring it to your primary care doctor.
www.mayoclinic.com/health/behcets-disease/DS00822I know it feels weird to suggest a diagnosis to a doctor, but it could solve the mystery and start getting you treatment. You might also have fibromyalgia - it commonly co-occurs with autoimmune diseases.