Take a deep breath and drop something.
The first semester of my senior year, I found myself with a schedule conflict that was going to keep me from taking a history class and an anthro class that I'd wanted to take for three years (I was a biology major). I also had two bio classes that I was NOT looking forward to--between them, they required a total of 3, 4-hour-plus labs per week. The college I attended is notorious for its heavy workload; they implemented a week-long fall break about 15 years ago in an effort to reduce the suicide rate (this in spite of being a small school with lots of one-on-one attention). After not sleeping for two nights running, I called my mother in tears to tell her I didn't want to be a biology major any more. I had been staying up late for three years, had no spare time to depressurize, went home deathly ill every semester from sheer exhaustion; I have good study habits and never partied and it still didn't save me. I was sure she'd be furious with me for bailing out at the last moment.
She said, "OK."
It's not as scary as it looks, and it will help you a lot with your remaining classes.