I was driving up on the interstate and I noticed my car began to overheat. I watched it go back down... so I continued. It went up again, like 3/4 up, still not red.... I pulled over and added like a quart of collant. Went back in the car and it wouldn't start.
Oil level is twice what it should be (anitifreeze?). When I tried to start it it turns but wont start, and the engine sounds muffled..... This is the head gasket right?

ANyone change this and can give me some advice?
Can it be anything else??