The abysmal pit is anything but different from the euphoric moments in your life, they’re both a state of mind. Even your mental faculties process reality on basis of causality, being mad or sad is nothing but an effect of a certain cause. Being aware to your mental processing can be in itself the cause to an effect of alternate state of mind. Learn from the stoics.
On another note, you have very little control of the next moment or the next day, don’t worry, that’s on your side. At the end of the day what rules is probability. If you’re sad, the probabilities are in favor of you being sad if you continue that line of action/thought without intending to interrupt it. While interrupting it, in whatever possible way, will always include a new variety of probabilities in the basket. So go ahead. Interrupt your fucking life, and alter things around.