Overheating!

I've got a '93 honda civic that has started this weird surging, rev-ing of the engine on its own when idle, either in park or at a light. Then all of a sudden last week I was driving to work and my temp gauge was maxed out and seconds later "boom" one of the main hoses busted. I replaced that and thought all was cool. The parts guy told me I could have had a stuck thermostat. So after replacing the hose, filling up with radiator fluid, two days go by and the same thing - skyrocketing temp. I replaced the thermostat. But same problem continues with me filling up radiator every couple days. Is my head gasket blown?