Rule No. 1: You are not a human being. You are a student. Those are different things.
Rule No. 2: Homework is more important than sleep. Stay up until three a.m. finishing your Algebra homework, you'll need it tomorrow.
Rule No. 3: The state of your mind is not a concern. The state of your brain is.
Rule No. 4: Procrastination is a sin.
Rule No. 5: You will have more anxiety than an asylum patient in the 1940s. This is normal. This is expected.
Good luck.