Some diseases are difficult to diagnose, especially in their early stages. Below are some of the few things you can do; - Ask for a second opinion from another doctor or let your primary care physician refer you to another specialist.  - Do your research about your symptoms. However, you must know what is good from bad information the internet is giving you.  - Listen to your body and mind. If you feel like there's more to what your doctor is telling you about your condition, you must take time to let yourself understand more about your situation. You can do this by logging the changes in your symptoms in a diary and show it to your doctor. Some diseases present symptoms that are hard to identify causes in their early stages. - Find a community or people who have the same issues as you. It could be the best option you have to understand more about your condition. Maybe you'll also learn from the past experiences of other people and apply them to yourself. - You may also look for more advice and raise your concerns to other medical institutions.