Hi i am not feeling any sensation in my penis anymore when masturbating erection in still strong but sensation in penis head has reduced tremendously i took a 2week break came back but the issue was still present using lubricant didnt slove issue?

I assume you're not experiencing true numbness of the penis but are complaining of reduced sensation. True numbness gas been described in men who ride bicycles a lot due ti injury of the pudendal nerve. Your masturbating technique may be the culprit especially if your grip is too tight or pace too fast. You might experiment with a vibrator or other sex toys to see if your normal sensation returns.