Girls who have given birth ?‍♀️ NEED YOUR HELP! I have a baby after a …

Girls who have given birth ?‍♀️ NEED YOUR HELP! I have a baby after a month of breastfeeding, switched to formula (formula milk is not suitable, very painful in my stomach and frequent vomiting) I need to stop lactation (breast milk from the breast) They advised pills, but I read about side effects and I'm horrified ??? They write that there is also nausea, vomiting and dizziness ? Can anyone tell me if they took such pills or acquaintances (relatives) who had similar experiences? What kind of pills and what were the consequences? (I read that it even affects health in some way) I just can't anymore, woke up this morning from terrible pain in my chest