try http://stopearlyejaculation.com there are many sources on the net you can use without asking, a problem like this is really too big to put in an answer, also make sure you see your gp.

You would kick yourself if you spent a month trying to figure out your own body to find out you have an infection, thin blood, or something simple that a weeks worth of tablets would fix.

Avoid anything with side effects, have a look at http://www.cureprematureejaculation.org for info on treatments. SRRI is one way to go, but its not recommended!

You can stop premature ejaculation by natural exercise easily , read , Christian Gudnasons’ book, The Ejaculation Master book, http://www.ejaculationmaster.co.nr , this guy grantees you ways that will help you have much longer sex , its just basically a few professional exercises that strengthen you ejaculation system in a few days
Hope this helps

consult a doctor rather than get answers from strangers who are not experts on premature ejaculation and erection. taking medication without prescription is dangerous. it’s your manhood you are placing in danger by doing so. in any case, try the jelq or the "stop & w-a-n-k" technique to control ejaculation and to give you a firmer erection. good luck & cheers!