Dear,
Welcome to HCM
We understand your concerns
I went through your details. Let me assure you,
masturbation is not unhealthy. Masturbation is normal and natural. Frequency of 4 or 5 times a week masturbation is pretty normal and not in excess. Therefore, masturbation is not the reason for your present problem.
I think you are obsessing with your sexual ability and sexual organ. Unless you are actually in sexual intercourse, you cannot judge your hardness. Secondly, when you try to test your hardness, the hardness comes down, because at that moment, you are diverting from sexual thoughts.
The reason for your present problem is simply psycho-logic and never organic. I suggest you to
consult a psychologist for sexual counseling.
If you require more of my help in this aspect, please use this URL. http://goo.gl/aYW2pR. Make sure that you include every minute detail possible.
Hope this answers your query. Further clarifications are welcome.
Good luck. Happy New Year. Take care.