I cannot quit while I am still working

My drug use physically gets me out of bed in the morning where I have enough energy physically to take a shower and get dressed. A lot of the times this is a chore. My drug use allows me to physically and mentally go to work and function like everyone else does. Without it, I simply cannot physically or mentally function like a normal human being. I am not justifying anything nor insinuating that I must continue to do drugs because of these facts because we both know that given enough time to heal, these things would go away in time - hopefully. All I am doing is telling it like it is. When I say I need it to function - I mean literally. It's going to take a lot longer than a couple of weeks to be well enough to function on my own and quite frankly, I can't afford to take off months from work nor would they allow me to. There is no way I would be able to quit while still working. It's not possible.