I’ve been living with Major Depressive Disorder for more than 30 years. I’ve had drug overdoses a couple times I actually died but they revived me.
I finally quit smoking tobacco, drinking alcohol, and doing drugs only to get diagnosed with Leukemia. I’m pretty excited about that because I know I’m going to die sooner than later and it won’t be considered suicide.
The point is, you need to struggle on and keep trying to live even if it seems like a waste of time. 
It does get worse, but somehow you can learn to deal with it.