A. staying calm is the best thing to do. confronting someone and being nervous or scared about it is never good. telling everyone what is going on is kind of vague, but assuming it means texting your friends and telling them the situation, then don't. it will only make the other person mad if they find out.
Mental health is important because without it, you wouldn't be able to do the things you want. For example, if i was going through depression, i wouldn't be my normal self, would I?