Remember, doing all this I-am-startup-man-stuff is very much possible when you are healthy. If you start to feel even the slightest bit sick, most if not all of it goes out the window. Feeling you are getting sick is a red flag from you that one or more variables (nutrition, stress level, amount of sleep, exercise, workload, social life) is out of whack. Better, focus on balancing your life so you don't get sick (eat right, exercise, take a break and go out with friends).