How about prune juice? It's a natural laxative.

I've used prune juice in the past with no change 

This is recommended family doctor 

I already bought it and I'm thinking maybe I shouldn't take it just worried that it may block me up instead 

It will not block you up unless you have a partial obstruction or something else you are taking is constipating you.  Prune juice does not constipate.

Thanks CTBarrister, much appreciated!!

Anything magnesium is generally less of an issue for me.  Even mag sulfate tabs. They're "osmotics" and pull fluid into the bowel, making a looser stool. 

1/2 to 1 tab works for me  or 15mls of Milk of Mag  works, too.  Have found I do not need a full 30mls to get relief.