Suggest Treatment For Burning Sensation In Penis While Urinating

Hello.

About 4 days ago my penis started hurting from inside near the end when going to the toilet, this lasted all day and i wasnt feeling great either.

The following 2 days were the same except i felt like a bus had drove over me, i had chills, sweating, aches, pains, nausea... never felt anything like this before.

My girlfriend took my temparture and it was reading 37.8, i started drinking alot of water, taking some vitamin c tablets and ibrufen.

Two days later i felt better, no more severe flu like symtons, but when i urinate i now have a burning sensation in my penis, its not painful.. just uncomfortable and wont go and i cant get an erection for long.

I dont know what this is... could you please HELP!!!