sounds like the symptoms i had when my HG went. i didnt have the mixture of oil and coolant. instead i had the mixture of coolant and exhaust gases. exhaust gases push the coolant into the overflow bottle. and in extreme cases they push it out and it overflows like crazy. mine did the same thing. 2 days later i was driving and the temp gauge shot right up, so i parked it and let it sit all day. started it up again, and white smoke as far as the eye can see. i think i covered my street with smoke. it was insane.....seriously, get it checked out. mine was so bad it warped the head. cost a lot to fix.
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