Are Fibromyalgia And Depression Interrelated With Each Other?

I have already been diagnosed with Fibromyalgia, Depression, short term memory loss and anxiety. Now I am being told that I am exhibiting signs of PTSD and possible bi-polar. The psychiatrist said that my symptoms are pretty much cyclical - fibro causing depression, and depression causing increased fibro symptoms. She said there is condition describing this - I thought she said it was Chronic Systemic Inflammation (not positive due to memory issues), but when I search this, it comes up with sepsis etc. Am I searching information on the wrong condition, if so do you know what condition it is I should be researching?