Sex related. In bangkok. plz advise.

I have always engaged in masturbation. Recently after moving to europe, I have started sleeping with female friends eventually having sexual encounter with condom protection. I am 24yrs old, 5 foot and 6 inches from bangalore and i weigh around 80 kgs. I have also performed oral sex with a girl. My mind is always full of sex even though i try to control. I am addicted to porn. for the past 5 years, i get a pain under my bladder when i jump from atleast 1 meter high. I am getting backpain and uncontrolalble headache. my marriage is fixed and im scared abt my health. my penis size is small and im not able to satisfy my girlfrend as well. i dont have stamina at all. i always feel very tired and dull. I also had 1 un-protected sex with an elderly women in bangkok.. plz advise. thanks in advance..