Problem of Premature ejaculation

I am aged 45, married and have a daughter. My problem is premature ejaculation. I used to masturbate during my school days. Generally I used to be slim, weak and low weight during my 20s and 30s. I got married at 32. During the first few years after marriage I never used to have normal duration of intercourse. But past three to four years, I have premature ejaculation. When I enter the vagina or after few minutes of entry, the ejaculation happens. I have other problems too –

1. The penis is too soft (or very small in size at normal times). I don’t feel like having it.
2. From my childhood days itself the testicles are used to be smaller in size (just less than 2 cm in diameter).
3. the forehead is too soft and when I touch it during the intercourse, that itself will make to ejaculate (or when I wear the condom itself)
4. I generally have black circles around my eyes
5. The day after ejaculation, I feel very tired, irritating, as if I lost my total energy. The black circles around my eyes further blackens or deep circles within the existing circles get formed. It takes few days to come to normal mindset. If I have two ejaculations within few days, then situation worsens further.
6. I need to wait for 2 to 3 three weeks to think about next intercourse.

I am of normal weight and height (68KG and 175cm). Please suggest medicines for my problems.