Hi Don't Think it's in your head , I think most of us went thru that at one stage
my Rh Factor Varies one time 68 then another 160 and your right it can be elevated for other reasons But one Reason it Won't be up is if you are over reacting or its "in your head" sorry you can't make your Blood tests Lie
so try to avoid people that think like that
it can take time to diagnose these RA or type things so try to be patient
keep a diary write your symptoms so you can take it to your next Rheumy Visit
Hang in there