Whats Happening To Me?

this is so messed up. i could be walking on the street and then i suddenly stop and just stand extremely still and blank out . and just stare directly. like for 5 minutes or less, and then i start feeling like there's a deep pit in my stomach and my heart gets really heavy and i get subtly sad. and then i start crying. this has been happening like 2 times a day lately. and nothings been going on wrong in my life. whats wrong with me?