Like, it's better to seek medical treatment about something going wrong in your body right when you know something might be wrong, rather than waiting until you NEED to go.
So, if you honestly think rehab will help you again, and that's what you want to do, I think you'll get more out of it by going before it gets to the point of you maybe getting out of control enough to where you're being made to go back. Better to take care of stuff early. But, also better to not get into stuff that's hard to clean up in the first place. I'm sure you know what you need to be doing, so keep it as a goal and work towards it.
Since your even questioning if you do or not, your going to go right back to whatever you were doing before. Someone who wants to quit already knows what they need to do, to do so. Good luck.
But like, it's good that you want to, you can do it on your own, with the support of your family and friends.
it'll be better in the end
doing it on your own would be super difficult. especially since it's been a day and you already can tell you're falling into old habits.