I wonder if it is very difficult to diagnose lupus?

I wonder if it is very difficult to diagnose lupus because I have some symptoms that leave me worried as for example: I feel a lot of pain in the body, my wrist and lateral elbows are swollen, sensitivity to light mainly fluorescent, strong headaches, I have cracks in the neck, arms and ankles, and my fingers turn white and purple with cold water, I thank you for the help, thank you.
Expert answer:

Lupus is an autoimmune disease with bases well established and known by medicine. Your diagnosis can be made from blood tests for the detection of antibodies related to lupus. They are not very expensive exams and can be requested by any doctor. If the initial investigation is positive you should go to a rheumatologist who will conduct a more thorough investigation and propose a treatment.