Hi.I have a colostomy and I take a stool softener with every meal;it helps me two ways:1)It helps the food to go through without clogging up,and 2)It makes cleaning and emptying my bag easier.
As for your blockage,Try some magnesium citrate,it is OTC at most places that have a pharmacy.Talk to the pharmacist and see what he/she says,to be sure its OK for you to try,and how much to drink.My Intestine doctor had me drink it to clean me out before a colonoscopy exam once,and boy,I didn't want to be too far from a restroom!It worked fast on me!Colyte will clean a persons intestines out pretty good,too,but,I believe that needs a prescription from the doctor.
Diet plays a role,too.Watch what you eat.Learn which foods affect you differently.Something bothers you,don't eat it no more.Peanut butter jams me up,so I avoid it.And popcorn,I love to smell it,but I don't dare eat it!Corn on the cob or canned,affects me,too.Refried beans causes me lots of gas.As does baked beans.Trial and error.
If you can,call your intestine doctor as soon as you can.There's a possibility that you might have a stricture of a part of your intestine.An upper GI and a colonoscopy will find out.I had a closed up part of both my small and large intestine back in '03,and ended up with my stoma.Don't want to scare you,but,it will be better to know whats going on,than to ignore the problem.
I hope that you won't have to go through what I did.So,Good Luck!Deano