Non gonococcal urethritis

Hi,

I've had urinary infection more than a month ago, i went to a different doctor and he gave me antibiotics and urispas. it subsided for awhile
but the burn and some slight discomfort came back 2 weeks ago.
I went to a different doctor 3 days ago and the doctor diagnosed me with NGU.(non gonoccocal urethritis)
he has given me antibiotics; bactrim(septrin) and ciprobay and also urispas.
he also told me that if it works, it should heal within 2-3 days.
until now i have been experiencing the same slight discomfort.
also, i have some extra-skin on my foreskin when retracted. i told the doctor about it and he said it happens as it's just the swelling.
Because when i had unprotected sex with my partner, she was having some sort of vaginal infection.
She also experienced urinary tract infection. could this be the cause as to why i contracted NGU?

some of my questions are:


how does one go about having NGU? (elaborate more about NGU)
could it be that my partner has a form of STD ?
How do i make the swelling under my foreskin any better? (it seems to be getting bigger)


Please do get back to me ASAP.
(i have not been given antibiotics for chlamidya as the doctor has told me that the pills were expensive)

Thanks alot.