I'm in the same phase right now, especially since my university recently came back from spring break, so I've been having to try and force myself back into a mindset where I can get work done. Tbh, for me that feeling of falling apart wasn't always warranted in hindsight. Pre-covid I'd steadily built up coping strategies that helped me do better at school as time went on and classes got harder, so I've actually surprised myself on several occasions by doing much better than I expected. I've also done the opposite though where I didn't feel like "everything's falling apart" about certain classes and wound up failing. For example, I got a B in Theoretical Physics despite that class dealing with some pretty high level math that I still feel I don't totally grasp, but I also had to take Multivariable Calculus 3 times in order to get a high enough grade to move on with my degree, despite the fact that on paper it should be much easier that a Theoretical Physics class.

Everything moving online due to covid kinda ruined a lot of my coping strategies though. It's nice being able to stay at home all day with my family, but trying to take an online Quantum Mechanics course with inattentive type ADHD while living with 5 other people is not easy lol.