When should I go back to my volunteer position?

So in June/July I nearly drank myself to death and was forced into detox/IP/rehab then voluntarily did PHP. I haven't been in the greatest states of mind since PHP ended. I have the time now, and they need the help. I just don't know if I should be put in a position where I need to be consistent with scheduling, need to be patient/calm with animals, and have to drive by my liquor store every time I go right now. But I think it's going to be a loooooong time before I'll be able to handle that position comfortably so why not go back ASAP?

Duties: feeding cats (it's an all cats shelter), giving them water, cleaning up their spaces, changing litter boxes, medicating them/wound care for those that need it, playing with them, transporting them to/from other shelters, reporting any medical issues to the vet/in rare cases of emergency bringing them to the vet.
Hours: I was just during it Monday nights 5pm-whenever we finished and dropping by whenever they needed extra help. I could tell them I can't consistently do Monday nights anymore, but I can pick up shifts when other people call out.
Me: Struggling with psychotic and negative symptoms from schizoaffective disorder, BPD chaos (mostly emotional lability, dissociation, sui thoughts, some funny shyt going down in my relationship, self harm), and alcoholism (been drinking, but stopped two days ago). I don't know if going back would help or harm. Especially considering it's less than 5 minutes down the road from the liquor store. And close to a bridge I wanna jump off.