tw kinda vent / Does anyone have tipps on how to deal with your own emotions?

recently I have this thing were I randomly feel a lot of emotions at the same time. this wouldnt be that big of a problem if they weerent litteral opposite emotions. today before going to school I already realised that its gonna be a shitty day I walked to my bus station and tears just randomly came rolling down my cheeks, like I was bawling in the middle of the street but then a secont later I started laughing uncontrollably. Im not even joking I was just standing there still crying laughing like Ive just heard the funniest joke ever an I couldnt even control it. Like wtf is going on. The other day I was really angry but also calm at the same time its so hard to explain. Honestly I really dont know what to do with myself anymore if anyone has some breathing exercises or anything please tell me since I dont know what to do