Aww sabar ye mama, lactose intolerance memang tricky! Honestly a few of my mum friends yang baby lactose intolerant try lactose-free formula or soy-based formula, and their babies do well; some paediatrician recommend trying hydrolysed formula jugak which is gentler on the tummy. Best thing is to check with your baby's doctor pasal which formula works best for your little one since they know baby's medical history, and they might adjust slowly je instead of changing suddenly. Hang in there!