I am anxious. I really want to know what happened. I am excited to know something. I can't wait to find out. I am waiting with excitement. It doesn't usually mean "I can't make a decision." It usually means there's something you don't know yet (like a book gets you excited or worried to know the end) and you can't do much until you know. Sometimes you DO have to make a decision, but being in suspense means everything has to stop while you wait. 'Suspension' is the word 'suspense' comes from, and it means everything has come to a halt, or is being 'held up' (like a suspension bridge) 'In suspense' often means you're waiting to find out if the ending is good or bad. "Did I get the job? I'm in suspense!"

You can say: Im on the edge of my seat.

I am on tenterhooks