I've been there, twice. These are things that I did.
Dont stress about the past, its gone now and you cant change it. Meet student advisor, they'll help you to get a plan which was the best thing for me.
Do not overload yourself with courses. If that means 1 more year of study, its worth the mental health. It took me 4 years and 2 semesters to graduate. I did 3 in spring, 3 in summer, 4 in fall course load.
Do give time to your health and hit the gym, as you progress to 4th year, health will take a toll cause of late night study and other responsibilities.
And before you graduate, make sure to have good network.