How To Recover Weak Penis Erection?

Hi doc,
I used to be a sportsman but had to cease all activities due to studies...
However ..I realised that I have started masturbating alot...like once everyday...and bow I start feeling that I have began to loose an erect penis..I am scared that I might never get erect again...
Is there really anything to be scared?? Can I recover my erect penis???
Is my case over as the nation or ED??