too much weakness till 4 days after masterbate

when I was 16 to 18 years I used to masterbate 10 times I was very crazy I dont know what I was doing , but now I am 31 years , Now I never feel erection some time only in night I feel erection which is too weak, if I masterbate one time I feel 4 to 5 days very weak and paralyzed I feel almost I will be died. all though all the time I feel very lazy and very weak I never feel like a young man, 30 % percent of my hair has become gray, my body become flabby /fatty very very loose . If I eat little bit oily or spicy food I get too much acidity. I have chronic Acidity and Gastric.

Now after two months I am going to marry I dont know what I can do. I have tried Agnus Cast 1 cm and Lycopodium 1 CM ,
Time to time I have tried Acid phos 30 and a few time China 30 .
My semen is watery/ very thin only 4 - 5 stroke of hand ejaculate me, that is also one of the biggest problem. even If I go for sex with my wife and If I ejaculate so fast how I can satisfy.
Under my Eyes there is dark gap. My bood cholestrol is high. my wieght is 92 kg I am 5feet 10inch. I always feel very very weak and lazy .
I am worst than an old man my uncle and grandpapa are momre active than me.
PLz help me Hhow I recover my self like my teen age.