Can you go to bed knowing that you still have stuff in the baggie?
It took me a long time and many years of doing drugs to be able to save my baggie and not blow it in a single night. What I do before I even take the first line is; I pick a time that I plan to stop and I stick to that time. I take how much I plan to do that night. Then I put my baggie in the car and park my car 8-10 blocks from my house. This way, I am not near the baggie and if I want more, I have to take a 15 min. walk to get my stuff. If your baggie is, out of sight, out of mind, then you are not going to be nearly as anxious after you run out. Creating some distance between you and your baggie really helps keep your anxiety down.
I also have Remeron (prescription sleep aid) that I can fall back on if I get really desperate. Remeron hasn't failed me yet and it cuts right though the coke, even if I did a lot. When I get really desperate for more, I take a sleeping pill instead. Within just 45-60 min., I start to feel really tired and once I go to bed, I qm out. If I did a lot of coke that night, the Remeron takes a little longer to kick in, but in the end, the Remeron always wins.