Thanks for the query.
The possible cause for pain during micturition and swelling of your urethral opening are:
Any possible abrasions due to rough intercourse
So better to consult gynecologist and get examined.
If that is not possible you can take sitz bath that can give some relief and on counter medicines like candid
jel, KY jel etc. Take plenty of oral fluids.
If the pain does not subside with this you need to consult doctor
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429