Erectile dysfunction. Good health!

I am not getting sex desire as I use to get before. I do get erection but it doesn't lasts longer, especially when I am in, once I get out, it's hard for me to get back on, I usually use fingers, to satisfy my partner, I used vigore , without consulting anyone, it gives unusual hardness at times, and sometimes it doesn't works at all. I am getting physically weaker and weaker day by day. If I sit too long I get numbness in one part and even while asleep if shoulder is pressed by my own weight my whole limb becomes dead, sometimes I have to lift it from other hand. I usually feel lazy and I don't enjoy any work these days. I lack confidence as well,I can devote sometime to become, stable physically, mentality and spiritually. At the moment I am lagging behind in all aspects of life. I think I should start off with physical aspect, so that my health is good. I am marine engineer by profession, my job requires lot of confidence, always alertness, positive attitude, good health