I've been on Lamictal for ~4 years; I've never completely stopped, but I've had some experience with tapering off while adjusting my dosage since I was over medicated for a while.
With dosage changes, first week is the worst for me. Usually, since I've ridden this ride a couple times and know there will be an end, I just try to take care of myself the best I can, be kind and patient with myself, and try to mitigate any reprecussions I might face from shutting down for a couple days lol. I suppose I think of it as preparing to get knocked out from covid boosters? Your body is (and your psyche is) managing changes and it needs to rest.

Consistency with food, water, sleep, and personal hygiene are your top priorities!

Runcible had it right that you should load as much of your day as you can to habit forming. Habits help you achieve things without having to actively think about it. Plans help too. If you plan that you'll go to sleep at 10 exactly every night, wake up at 8 sharp, eat breakfast, then shower next, then half of the hours of the day are already taken care of. Past you can look out for future you. \o/
Decision-making is hard when your brain is focusing on managing brain chemicals. Habits help you take care of yourself on autopilot. Maybe set aside 30 min tomorrow to write down what a human body needs to live?

I know it feels like it'll go on forever, but eventually your brain chemicals will start adjusting and adapting to the changes. Be kind to yourself, try to do right by yourself, and love yourself. You got this (: