Nausea in third trimester!

So at the beginning I only had severe nausea from week 5-9. And its back. Its the type of nausea where light makes you want to throw up and drinking it eating anything makes me want to throw up but I don't I just feel really nausea! I am drinking enough water daily so I know. Im not dehydrated, only thing that has changed is now ive started the persistent horrible heartburn were sour thick liquids coming up and burning from water and anything really. I don't know if that's causing me to be nauseas or what but anyone else getting super sick to their stomach? Im 29.2 days