A couple of months ago I did a solo ride (50 miles) and pushed it more than usual. One section has 4 consecutive hills - a couple of them are over 15% grade, the other 2 are around 10. At one point (the end of the 4th) my HR got to 184, highest I've ever seen it. What makes me wonder if this is my max (or close to it) is right after hitting it I felt sick - like a period of 10-15 seconds where I felt I had the flu or something. It passed pretty quickly as my HR dropped - is this a good indication that my max had been hit?