[NeedAdvice] Wasted my entire vacation

I had about 3 weeks of vacation from university. Before this, I was studying almost daily, but somehow during these 3 weeks I fell back into video games, tv shows and excuses not to go to the gym or study, bad habits that I succesfully got rid of when I started this semester. I almost never doubt myself but, this month I will have 5 exams and I just can't get over the fact that I wasted 3 weeks and not prepared. I still have a somewhat time but I feel like it is not enough and I have a constant stress and fear that I can't get rid of so I can focus on the present and start preparing. I feel like if I fail now my goals will never Be achieved again. Any advice is appreciated.