What Causes Pain In The Neck,back,chest,ribs,buttocks And Legs?

I'm a 38 year old woman, 5'2, 118lbs. I have been experiencing pain as though my skin is bruised, however, its not. It mostly sore to touch from the nape of my neck, down my back, chest, ribs, buttocks and my legs muscles are very painful. I felt this before when taking large doses of steroids for Stevens Johnson Syndrome in 2008. Dr's attributed the feeling to the meds. I'm no longer on any medicines and wondering what could be going on. It appears to be more noticeable during my menstrual cycle. I should mention that I was diagnosed with carcinoid tumor in 2008 as well (removed and now clean), and that I also have Interstitial Cystitis (frequent and painful bladder). Any thoughts?