Pink discharge, sevre cramping off and on, discomfort peeing sometimes in lower back, bad pains after sex ? help do i have std or is it my cyst

Need more info...: The info provided is not enough to deduce accurate diagnosis (Dx). To unveil the myth behind yours symptoms (Sx), one has to review detailed history on the specific features, relevance, & sequence of events of all symptoms + findings of physical exam + testing as needed although possible disorders of urethra, prostate, etc. could be the center of concern.