Does any one know what a huge drop in Globulin means and what could cause it?!?

I'm 16.
My igM, igA, and igG has all dropped in the last 2 weeks.
I was tested for Crohn's diease, but my colonoscpy came back fine. My doctor has considered Rheumatoid Arthritis, Lupus, and Anklosing Spondilitis.
I get headaches, stomach pain, rashes, joint pain, diziness,fatigue, morning stiffness, muscle/pain spasms, ankle/knee swelling, neck pain, excesive sweating, chills/being very hot and low grade fevers.
My headaches last every day, I had an MRI and there was no illregularity. I had a muscle abcess in my psoas muscle in feb. My rashes are common and sometime are hot to the touch. My morning stiffness last for about 1 to 2 hours. My ankles/knee swell and retain water.
My blood results show anemia, high C-reactive protien, and a high sed rate.
I think that is about it. Any questions and just ask.
Thanks, Sarah
My doctor told me, he had no clue. I was just wondering.

Why would you want a bunch of guesses and speculation that would probably be way off base? Wouldn't you rather have something more definitive? Rely on your doctor for answers.

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