How to make screen shake only when effect damages player

Hi everyone, I am making bleeding effect, it will damage 1 hp every 5 sec and wont damage player if they have 1 hp. The screen will shake every time it deals 1 damage to the player

But when i tested it, it didnt work properly

It shakes rapidly, only stop when I have 1 hp.

Here is the codes and the test video.

https://imgur.com/a/JnHgqvw

How to make it only shake when it deals damage to the player? Or better, not shaking when effect affect player?

Thank you.