What to do when the coolant turns milky colour

It all began when my car could not start after cranking many times, even though it did start but it dies when I engage to drive. Thus, I had to tow my car to the workshop to rectify the problem. According to the mechanic, it was believed to be head gasket blown and the engine head too. I decided to replace those part and resurface the head gasket to solve the problem. After the mechanic done the job, I suspect the coolant turn to milky color, I thought it is just some small contamination so I just not to worry it. After driving few days, the milky color still present in the coolant. Based on my research on the net, it says that my car had a blown head gasket or crack head which I just changed those. Is it safe to drive the car in this situation for few days? I do hope you could solve my problem as I currently only have one car for my transportation. Thanks!