Diagnosing Rheumatoid Arthritis

for about a year now my hands have been hurting,they tingle and burn and they swell and turn red and the bottom joint and hurt very much.Now they are stiff in the morning and I can not walk very well as my hips and my feet and ankles and knees are stiff and hurt so bad!! It is bad in the morning and after I have sat for awhile and really bad at night.  The pain walks me up most of the time.It is on both sides but my right allways hurts more! My hands turn very red and get these things that look like blood blisters on them and hot water hurts them.My ankles and my feet are starting to swell now also,with pain that runs up my shin now. At my job I have to type alot adn file and write and my hands and wrist just hurt so bad, not sure how much more I can take!! I am taking 3-5 800mg ibuprofin a day and I still hurt so bad.My doctor thinks it is RA and has ordered some test.My question is are there other type of arthritis that can do this also. Any information would be helpful as I do not know anything about arthritis.