maybe you could also look for crisis lines,
I've done some things that aren't like me at all and dont seem under my control. I never drink - but when I was a certain way ended up getting drunk...
what might help is using some grounding methods to remind yourself who you are, where you are, and why you dont want to do these things.
Some ways to ground are to describe the place around you, to remind you where you are, and to try to ground yourself in the present time. Write up a list of why it is bad to drink too much or have these pills and have it in a spot right next to the pills and the bottles, if possible. That way, before you get to them you have a reminder, it might not work but it's worth a shot.
As far as the grounding, try to describe with as many senses as possible.
If i were going to do that right now, I'd say:
I'm in a room with lots of computers lined up in two rows. There are white walls. I am slightly cold. I don't really smell anything. It is slightly dark. The keys on the keyboard aren't quite smooth; there's texture to them. I hear a slight hum from the computers but otherwise it's quiet. I'd continue with more details if possible.
The above description includes sight, smell, touch, and hearing... get as many sensed in there as you can. This kind of grounding is a practiced skill, but maybe give it a try, it might match what you're dealing with.

You can also, repeat something you make up foryourself... that list of why you shouldn't "I don't like ot have this many meds because 1.2.3. etc???

just thoughts

*hugs* hang in there