Overthinking is killing me day-by-day. What should I do?

Man, that sounds rough. Seriously , its like my brain wont shut up sometimes and its exhausting . I spend hours just replaying conversations what i shouldve said , coulda said , shouldnt have even said . Its a vicious cycle , you know ? Then its what if this happens , what if that happens . . . its endless . I lay in bed at night my mind racing , cant sleep , totally stressing about stuff that probably wont even happen . Like yesterday , I spent half the day freaking out about a potential work email that never even came . I just imagine the worst , always the worst case scenario . It affects everything ! My relationships, my work .. . even simple things like choosing what to eat for dinner become major decisions . Ive tried meditation , kinda, but my mind still wanders . And I get so frustrated with myself , like why cant I just chill? I feel like im drowning in my own thoughts sometimes and gosh its overwhelming . I feel so stupid . I cant believe how much energy I waste doing this. It's impacting my ability to be present and enjoy life . I really need to find a way to stop this. its not fair . You will find a comprehensive and effective strategy to overcome this in the explanation in the biography .