As you rightly said, it's all mixed up. Quite possibly you are interacting orally with too many people at the same time, on phone. Learn to first switch off the phone at times like this, and think and reply to people. Most people don't realize that, they get possessed by people through phone, because neither know when to end it, and it gets argumentative. So stop replying people on call / on demand basis, and switch to messaging or emailing. Cut the call if any of them start to shout. After a few times, they will learn. OR put them off by putting the phone on mute and let them shout, and after a while, say "hello" and say that your phone goes to mute when someone shouts.
Calmly sit with a paper and pen, and start writing all your issues down and prioritize which one is more critical. Then find a solution to each problem. Don't worry about problems that doesn't concern you. The art is to buy time and get relief from the tight situation.
