MS and Paralytic Ileus

Is Paralytic Ileus associated with Multiple Sclerosis?  I seem to be unable to pass stool -- even though I take Miralax daily due to the many constipating medications I take.  All I could find when searching for some clues regarding the severe constipation I have (I haven't had a bowel movement in nearly three weeks) was the condition named above.  

I am not experiencing any abdominal pain or hardness, bloating, gas, -- nor any urge to defecate.  I am recovering from a recent MS exacerbation brought on by an upper respiratory infection.  I did five days of Solu-Medrol - one gram a day.  I was hospitalized during that time and blood work showed a low blood potassium level - this was before the steroids.  I don't know if that is significant information - but thought I'd mention it just in case.  I took oral potassium at the hospital.  

I did have what seemed like a mild stomach ailment a few days before the cold and subsequent time in the hospital where I had diarrhea ( no vomiting) for a day or two.  My appetite has been pretty nonexistent, but I have been eating --mostly cereal -- and I thought perhaps I wasn't moving my bowels because of my lacking diet; but it seems that the muscles are not behaving normally...pushing waste into my colon or rectum where I can feel it.  Should I be worried?