I am seeing a new Rheumatologist due to new onset on symptoms. I'm having intermittent bilateral calf pain, not cramps, for no apparent reason over the past year. Extremely tender behind knees and along calfs. Tightness in calf muscle to the point sometimes I limp. Doesn't appear to be coming from low back per MRI. Nothing makes it feel better, comes on 1 or 2x a month for 4 to 7 days over past year then disappears. Anyone else have this. Thanks!