Don't get frustrated and don't give up.

It kind of sounds like you were trying to make things happen instead of just relaxing and letting them happen. I still haven't experienced full body orgasms, but even what I've felt so far has been wonderful and more than I ever expected I could feel. Your body will surprise you.

It's been said lots of times, but it's worth repeating: Relax and feel the sensations. You've already had a taste of what lies ahead of you.