Aww mama, yellow vomit tu biasanya bile yang keluar, memang lega lepas muntah tapi loya yang berterusan memang letih, especially dah masuk trimester ketiga ni. Boleh try makan dalam porsi kecil-kecil, elak makanan yang heavy atau berminyak, dan pastikan hydrated sebab muntah banyak boleh jadi dehydration pulak; since you're still experiencing this at 28 weeks, it's worth mentioning to your doctor next visit to make sure everything okay. Hang in there mama, some mums do get morning sickness till end of pregnancy, tapi better to get it checked just in case.