What should I do if I am being harassed at work by my supervisor on a daily basis and everyone in the office knows?

Either find a way to get along, or find another job. If you do not, you will find yourself unemployed. It is easier to find a job when you have a job. Not all harassment is illegal. If this harassment is not motivated by race, age, sex, religion, handicap, or national origin, it is completely legal, and you have no legal remedy. What you see as harassment may simply be another person's management style.