Hello I notice your symptoms include joint pain with fatigue. It is good you have seen some doctors already. Other causes of your symptoms include fibromyalgia ( a diagnosis of exclusion, after all others have been ruled out), chronic fatigue syndrome, polymyalgia rheumatica, and hypothyroidism. You did not mention if the painful joints were swollen such as in rheumatoid arthritis, psoriatic arthritis, and systemic lupus erythematosis. So seeing a rheumatologist is the next step to take. Other conditions such as liver infections, hepatitis and cryoglobulinemia can also cause these symptoms. I hope this information is helpful