Health Regeneration?

Hello im developing my gamemode(Garrysmod Campaign)

and its been pretty well right now im thinking on how to add the Bleeding damage

Example in call of duty black ops when you get shot some blood appears on the Screen and the camera shakes and also you lose health but if you take cover for a while your health regenerate again

so right now im thinking on a way to do this any tips or hints are very appreciated!

PD: for some reason the SharpeYe addon by Huuricane isnt working on my gamemode and i even derive it from sandbox!

set up a timer that uses

but then how i would add the camera shake and the blood on the screen?

for blood
and for shaking use this