I had my period for 14 days and it doesn't seem to be ending. It has been on and off light and dark. Is it okay for me to have a period this long?

See below. Problems like these can only be correctly handled by your doctor in person. He/she needs to listen to you, perform an examination and possibly run labs or other tests. That's the only way he/she can find out what's going on and what to do about it.