I use the tagline, "I am all hopped up on goofballs." You can see it on the bottom of this page. I took it from an old Dragnet episode. The Simpsons later used it as well. I like it. It's funny. And for the better part of a year, I was on heavy painkillers, so I can relate.
I am by no means an expert at all of this, but I don't see how cocaine can be classified as a depressant. It is like they got lazy. Let's just make Goofballs/Golfballs the depressants and call the other thing a speedball.
But they can't even agree on what a freakin' speedball is for heaven's sake.
I have found it helpful to do the stretching exercises my physical therapist recommends. Do some core strengthening exercises, such as the ones highlighted at The Mayo Clinic. By keeping your core strong, your back won't put itself in a position to cause that sciatica pain you are having.