Earlier quoted context omitted.
Noticed that both you and the OP mentioned drinking. Just the drinking can cause much of this. Drinking screws up your sleep cycle, which can also cause much of this. Drinking sessions are also time consuming, so you have less time for other things you enjoy anyway. Sure, some things you can do while drinking, but those may not be the things you would prefer to be doing while sober.
I was under impression that an alcohol causes a depression.
I have on many occasions beaten back total anhedonia and a desire to die with a few drinks. It's not an optimal solution obviously, but when your options are limited it is sometimes quite preferable to not drinking.