First of all,
This situation we have all been thrown into is horrifying.
This first started when I was a Junior in Highschool, right smack dab in the middle. I quickly learned that I didnt have any friends. Im 19 now and in college. My main drive to get through the day is that one day I will have a Masters Degree,be a CPA, have a really good Accounting Career and will be making bank. That only holds up so long though, when reality checks in and im like "who the hell is going to give me job smelling like this." I often cry thinking there is no hope, but deep down in my heart I know one day this will be just a figment of our imagination.
About the weak sphincter muscles, there is an exercise that you can do to tighten the muscles, they are called Kegel exercises.
If you know you are about to be thrown into a social situation (this may sound crazy) but go to a happy place in your mind. Dont think about whats about to go on and all the bad things that can happen. I have found this helpful sometimes.