2002 Honda Civic

Why would my overflow not empty into my radiatior when its low. The level in overflow is way past max level and I need to add coolant in radiator? I see no leaks anywhere, no water inoil or coming out of exhaust, my radiator cap broke, I overheated, and overflow cap blew off.. My guage rises alittle seems like when I drive it for period of time and then go in stop and go traffice. It gets higher than I put my het on to lower it. Im at a loss and going crazy. Dont have the money to take it somewhere and I think I am out of ideas. Please help me.