No ... I don't wonder that at all. I give the "make it back" part of the dive enough thought before I enter the water that I'm pretty confident I can deal with whatever I'll need to.
If I didn't feel that way, I'd be making a less aggressive dive plan ... or deciding not to dive at all.
If you always wonder if you're going to make it back, that's a pretty good indicator that you're diving beyond your ability.
... Bob (Grateful Diver)
For this and the earlier posts. I appreciate it.