i went overseas and slept with a girl and the in the next couple of days it started.
Here is some information you might find useful. Anytime you have pain in your penis, it's best to see your doctor. You can read here in the symptoms database, this information about pain in the penis. Also, since you said you have a discharge and this started after sexual relations with a certain girl, you should probably be tested for a venereal disease. Do not hesitate because if you do have an infection it could cause some damage.
Here is some general information for you to look over. This will help you ask all the right questions of your doctor. You can read about
erectile dysfunction here, the basics and what some of the causes
are. The symptoms are
listed here. There is a good section
about coping here that might have some information you find
helpful. Should you be diagnosed with ED, you can read about drugs
commonly prescribed and treatments here. This is very general information, and should not be used as a replacement for your doctor's sound advice.
Take care and stay in touch!Vicki M