ED & premature ejaculation. Advisable?

I am not getting proper hard erection for sex. I smoke 1-2 cigarette a day, I have bit of high BP i.e 110-150, and hypo-thyroid. I am too much inclined towards sex. I oftenly have sex with my wife or masturbate watching porn. Other problem is I don't last long in sex. In first round of sex I ejaculate almost within 30-45 seconds and it is indeed shameful. I last little longer in round 2, but the erection is worse then the round 1. Pl advise what shall I do and suggest an treatment for ED and premature ejaculation. Also, lately I have seen too many ads claiming meds for increasing penis length and girth and intercourse time. Are these meds effective ? Are these advisable ? I would love to have a bigger penis with strong erection and longer time. Kindly advice.