I had that with my first dialated to 4cm at 30 weeks and spent the remainder (7 weeks) on full best rest. I have 3 hernias with this my 3rd pregnancy. unfortunately I am unable to rest as I have a 4 yr old and a 2 year old with no help at all. I know it is hard but it will be over before you know it. so just try and take this oportunity to rest because there will be none once the baby is here.
So sorry you have to be on bed rest! With my last pregnancy, I was on Procardia and bed rest from 32 - 36 weeks because I went into pretern labor (dilated to 4cm with bulging bag of waters). It drove me absolutely crazy...and then he decided to stick around until 38 1/2 weeks! Drove me crazy because I thought since I'd been working so hard to keep him in, the minute I stopped he would arrive, lol.