Hi there, you sound like you have a lupus pattern of symptoms to me. Write down all the symptoms you are experiencing. Take pictures of your rashes if they are not always present. Mention the family history of autoimmune disease. The GP ideally needs to do blood tests to look at your inflammatory markers (ESR, CRP), a Full blood count (FBC), Liver and kidney function tests, and to see what your immune system is doing which involves an Anti-nuclear Antibody Test (ANAs), he could also look at Complement levels (C3, C4). This should pick up if you have an autoimmune disease.
Not all GPs will be on board or understand how to read all these tests so they should refer you to a Rheumatologist who can interpret results and combine these with a physical assessment of what is going on for you.
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