New dx? Elevated sed rate & RF

I've been having episodes of my arms turning very red, burning and a raised welps. The last time it happened it also went to my legs.  This happens about once a month, always in the evening while I am sitting doing nothing but watching tv. I've gone through all the things I could have caused allergic reaction, nothing fits. After relating these episodes to my dr, she ran blood work. Results were, elevated sed rate and rheumatoid factor. So I am now waiting for appt with rheumatologist in December. I can't believe that's the soonest I could get in, but it is!