Don't worry, Mike. 2 1/2 G's pulling up so it won't come out of your mouth until you are in neutral G going over the top. Then it will go to the headliner, which is now the floor. You don't have to worry until you level out at the bottom.
When I only do 1 loop, I actually end up @50 higher than I started and end right at cruise rpm. 11 is the most I have done in a row. Have to start higher, as I unload the wings, over the top, which increases the descent speed, allowing a good entry for the next one.
What if it stalls inverted? It just comes right on around and you would never know you stalled except for the bump, when it stalls, and the mushy controls when you try to recover fom the dive.