Probably is gonorrhea if your previous sex partner says she has it.
I had similar symptoms as you except it didn't seem to be as intense.
I had:
- Itchyness inside the urethra
- Slight burning sensation when i pee, however this kind of relieved the itchyness.
- Clear/white discharge from the penis
I was diagnosed by a doctor with Chlamydia, much less serious than Gonorrhea.
I'd say don't have any more sex, go speak to your doctor, whom will definitely send you off to get a blood sample for testing.
If you come back positive, make sure you notify all your previous sex partners that you have it.