Girls, I stopped breastfeeding my daughter three weeks ago, her behavi…

Girls, I stopped breastfeeding my daughter three weeks ago, her behavior has changed drastically, she's become capricious, sleep is terrible, she goes to bed late and can wake up very early, I think I'm going crazy, I start thinking that something hurts her, I tell my husband we should take her to the doctor, he stays silent, but I already start thinking that it's not about the child, but about me needing to get my head checked. Who has experienced this, how long did such behavior last for your kids?