Alcohol thins the blood.
Probably stands in the way of your body repairing itself.
But does go well with opiates.
I say take both.
You are right about the fact that alcohol impairs the healing process. I wouldn't recommend it as a pain killer. By the time it numbs your pain, you've had too much.
If one is looking for a relatively safe pain killer other than the usual prescriptions, weed is better than alcohol. Fortunately, in Oregon medicinal marijuana is legal with a doctor's prescription. If you don't want to smoke it, it is available in other forms.