We call it black mania in my support group.
Understand that chemicals are fireing in your brain. Receptors for those chemicals aren't working. Your system keeps producing more, but they don't have a place to land.

It's kinda like a person who suffers Parkinson disease. The receptors for the dopamine aren't the right shape.

Understanding will help a little. But what you really need is care. Do you have any help?

I once got a nurse from my girlfriends church for $15 hr.

You need sleep. Lots of fresh food and vitamins. Maybe a light box. Vitamin D.

You could also try acupuncture or massage. Aromatherapy. Hot Epsom salt baths.