Proctitis-ms not sure?

I was diagnosed with ms in 2010, I have now recently been diagnosed with proctitis. I havnt been given a lot of info about it from the doctor just been given a 2month course of suppositories. I have goggled it to and it says a few thing that can cause it and one cause could be an autoimmune disease, but is ms this and could it have caused this problem? Nicola x