I had open heart surgery back in 2011 ever since I have steadily gone down hill. Been to every dr around and no one can come up with a diagnosis. It's bad all the time but flares up really really bad about every other month where I am bed ridden. The symptoms are faint queezy feeling burning hot and very sweaty all the time short winded , hurting aching all over all the time,itchy skin all over shaking very tired and weak very hard to walk due to weakness in the knees . What could this be ?