Very painful cramping and stabbing pain center below belly button after urinating. normal urine. happens frequently, pain shoots down between legs. last transvaginal ultrasound normal over a year ago. could this be bladder problem

See below: Since your primary symptom(s) are pain associated with the act of urination in the presence of a normal urinalysis and transvaginal US, “Painful Bladder Syndrome/Intersitial Cystitis” should be considered. The website “www.ichelp.org” can provide you with more information and insight. Would recommend you see a urologist for further evaluation and inquiry about this. Hope this helps.