What Causes Severe Joint Pain In Arms, Neck And Legs With Painful Rashes?

severe pain I am a 23yo female with severe joint pain. the pain is in my arms, upper back, neck, and right leg. this is not a muscle ache it is an actual joint pain. the pain started last Saturday when I had a random rash appear on random spots on my body. the rash comes and goes but never appears in the same place, the rash is a red, raised, very painful circular like spot. since the rash has appeared the joint pain has been very severe the only time I get comfort is when I am sleeping. I am a medical assistant and the Dr I work for said he has no idea what the rash is or what caused it. I have not changed anything in my daily routine. no one else in my house has it. my Dr thinks it may be viral and said to give it 7-10 days but it is getting worse to the point that I m in tears. I need help