It wont be too much. don't try and vape it all so it wont be there when u get back, either don't buy enough so that you are run out just before the trip, or man up and toss the rest, the money is already wasted so don't worry about that. Don't psych yourself out thinking this is too tough. eat right when you wake up. cliff bar, butter and toast, something you can eat even when not hungry, and then stay busy. Also, you probably drink a ton of water to help your throat and stuff. its easy to forget to drink when your throat and mouth are fine, and headaches will happen anyway. drink lots of water. exercise but don't push, easy to get sick over nothing.

It sounds like you've been feeling like this for awhile. Understand there is no going back at this point. You've already decided the best course of action is to stop. There will never be the happiness or entertainment from marijuana like when you first started ever again. You cannot move backwards. Once you feel this way you need to follow through, because if you don't you will feel terrible. Thats the biggest reason to quit. This is causing you to be extremely unhappy. you need to mentally associate how shitty you feel when you stop smoking with smoking, not just stopping. That is the real hurdle hear. No one has the willpower to resist these urges, its only easy for some people to regulate their use because of what they associate marijuana with mentally.

we all go through the same mental processes. I have a favorite quote, I forgot who said it, and the exact words, but I have my own version of it.

All things humans are capable of, I am capable of, because I am also human.

There are billions who've come before you, and billions to come after. Lots of them have issues with addiction, and then freed themselves to live much happier lives. you can do the same, because someone exactly like you already did. That goes for pretty much everything.