It must feel terrible to feel so out of control of your feelings. It appears that you feel the most vulnerable around the things you care most about.
When a glass of water is already full, it takes only a drop to make it overflow. It’s as if your nervous system is already just about overloaded and then these important issues push you over the top.
I do suggest that the first thing to do is to see your medical doctor to determine if there is an undiagnosed medical issue going on. There is sometimes a link between emotional symptoms and medical problems. Take a look at this article here at PsychCentral: https://psychcentral.com/lib/involuntary-emotional-expression-disorder/
Another possibility is a medication side effect or medication interactions. If you are taking any medications, you should also talk to your doctor about whether they are contributing to your emotional sensitivity.
I wish you well.