Didn't want to assume.
--anyway, i would recommend lots of back limbers and back walkovers to gain comfort going backwards.
--Jump back drill to a flat lying position on a resi.
--Spotted BHS focusing on the jump back w/ coach stopping you in tight arch handstand.
-- conditioning... push-ups, v-ups, etc. until you feel comfortable that you are strong enough to catch yourself after you jump.
-- a ritual so that you have a pattern to follow and cannot just stand there and not go. For our new girls working bhs we say "stretch, squeeze, go"
Good Luck.