Hi There, (Mid 30's male)

I am new and extremely worried and concerned - I can only hope that you guys can help me understand what is going on with me?

In May 2008 my joints became sore and tender for a month then it went away for 3 weeks, in June in cam back for another month this time ankles, wrists shoulders knees. I was concerned and my dr ran blood tests which came back great no elevated signs of anything? Again it went away for about 2 weeks, then it came back again this time only in my wrists elbows and shoulders - it was a dull deep pain in my joints and no meds helped to rubs helped? Since then it has stayed the same in my joints but I now have arm tendon pain? and feel like someone has straped bands around my forearms? wrists the tendons hurt in the joints?
Its cronic - while i am typing this it is hurting?

I am freaking out? what is wrong with me?