Sadness and altered personality

Sometimes I get really upset/emotional about things and I can't explain to myself why but the worst thing is that it feels like I'm being real and not overreacting at the time but then after I feel as if that was never me controlling my thoughts :/ like as if I was intoxiacted :/ I've been doing marijuana for about 2 years and have done it I admit too often lately perhaps that has something to do with it or does anyone have any thoughts :/// I hate it it's like I'm a different person. Btw I have dealt with anxiety and depression in the past so maybe that has an impact :/ Idek really