Doesn't prayer flick all the time so your health does go up an when it does it stays on for way longer than necessary, using excessive amounts of prayer points.
If your health goes up its a result of gaining hp levels, not a fail of prayer flicking. I'll speed up the rapid heal toggle but its on for at most 1 and a half seconds. At +3 prayer bonus, I use less than 15 ppoints on a 2hour run :P