18 days. i feel lost. how do people do this??

i developed a bad dependency and then CHS. i felt my body failing and i had to quit. now, 18 days sober, im just wondering how the hell people even do this. every day feels so LONG and i just. no matter what i try to fill it with there’s still those times when you wake up or lie down for bed and feel awful. i’m medicated for my mental health stuff, im in therapy—i don’t even know anymore. it’s just really difficult. looking for reassurance i guess? advice? idk i just need to get this out there