Ah, at 37 weeks the frequent passing motion and heartburn boleh jadi normal sebab baby dah besar and pushing down on your digestive system, tapi kena monitor closely lah especially if you're vomiting regularly, best to mention it to your doctor just to be sure everything's okay, especially the panas tekak part because sometimes it can be a sign of something yang kena check. A few of my mum friends also had similar experience towards the end, but they said once they avoided spicy and acidic food, terus better; try eating smaller meals and avoid lying down right after eating, that helps with the reflux.