Urinalysis and culture both came back clean but i am still experiencing symptoms? what could be going on ?

Chronic inflammation: You could have a more chronic inflammation, such as interstitial cystitis rather than an acute infectious cystitis. Interstitial cystitis requires more ongoing treatment and can be very uncomfortable. Talk with your primary care physician about what's happening with you -- you may also want a referral to a urologist. See additional info at http://www.Ichelp.Org/page.Aspx?Pid=571.