Been Told I Have Chlymidia And Have Taken The Right

Been told i have chlymidia and have taken the right meds and its gone but then al of a sudon i have had this wierd feelling in my penis? Its red on at the tip but only on the tip, now n then its itchy i did also a stickt substance on the penis head it self, i got told i can have symtoms up for 40 days after meds but i dunno about this and i can have sex