Nodules On The Tendons Behind The Knees. Severe Leg Pain, Fatigue. Fibromyalgia?

why do i have small type nodules on my tendons maily behind my knees some throughou legs, ive had extreme leg pain for many years, right side being worse then left. never really recognized the nodules until the last few months. of cousre i have many other symptoms though it all started there with extreme fatigue. ive been told i have fybromyakgiia, ms, sleep apnea, anxiiety and this never ends. is this just a simple thing i could fix and stop all of the rest of stupid symptoms....wow wouldnt that be great. it started back when i was in marial arts at the age of 30 and now i am 43 and taking half of the pharmacy......a friend just told me she got these from swimming and had to have them spooned????