Been there my friend. Kicking is as low as a human can go. All of the chemicals in your body and your mind are trying to punish you in order to drive you back to the drug. It tries to convince you that the only way out is to use again. It is a lie. The only way out of what you're going through is time and suffering. You will suffer and it will take time, that is the truth. But in time, you will improve. You will recover. For now, eat if you can, drink if you can, sleep if you can. Look up NA speakers on Youtube if you can. You will find countless people who have been exactly where you are and have recovered. Don't give in. Resolve yourself to endure the pain with the promise of a better future.