Hello, By going through your symptoms it seems that you are suffering with acid reflux which is very common during third trimester. Which would have been induced due to lack of sleep in your case. Follow these precautions to prevent Acid reflux Eat 2-3 hrs prior to your bed time Avoid spicy foods Take divided frequent meals than a heavy meal If you have to sleep immediately after taking food,try sleeping in a semi prone position Sleep atleast for 6 hours during night and 1-2 hours during day time Try taking an antacid if severe. Hope you will feel fine the advise given Do not hesitate to ask any further concerns.