Burning Sensation After Masturbation

my age is 29 yrs. symptoms: Fungal infection, rashes in underwaist areas, and this has been very common to me. on penis, testicals and on tail bone. main problem is after masturbating whenever i pass urine there is burning sensation. earlier it used to occur when i was masturbating after 10-12 days, but for the last 3 months it has started occuring everytime. yes it occur on the same areas but fot the last 4 months there is itching on my tail bone and there is some swelling too. i dont have fever, but i have azoospermia. yes for 15 days i have taken allegra and nizral tablets with some dusting powder on the affected areas. i have had sex with one girl about 1.5 yrs back, but this burning sensation starts about 3-4 months back, i got my urine checkup done but every thing is normal in that. Please suggest why this burning sensation happens after masturbation while passing urine