How can I control my tears in uncomfortable situations?

Well in my previous experience I have had to stop what I was doing begin breathing in and out slowly while trying to switch my thoughts from what I am currently thinking about to those that are more relaxing and happy. This can be very tricking when you are crying uncontrollably so the most important thing to remember is it is absolutely okay to cry and feel those emotions. If you still are feeling uncomfortable in the situation you can just let the people you are surrounded by know that you need a moment alone to catch your breath.