Burping thousands of times a day

Hi all - For the past 8 months, I have developed a small burp in the back of my throat. It happens as soon as I wake up in the morning and is exasperated by a small sip or water or anything that I eat or drink. It is also worse after I have been moving around such as from laying down to standing up or in a car/on a boat. I have changed to a completely bland autoimmune paleo diet with no spices, tomatoes, etc. and started taking Prilosec twice a day and nothing seems to help. I had an endoscopy and ultra sound of my thyroid (I have Hashimotos/hypothyroidism) and all came back negative there besides a very minor hiatal hernia. I've never had burping or GERD problems in my life -- I remember as a kid I didn't know 'how' to burp. Has anyone experienced this? Could it be related to my lungs/trachea/windpipe? It literally happens the second I take a sip of water before it even gets down into my stomach. If anyone could help me, I'd be so grateful! Looking for answers and very worried.

Thank you so much for your response! I have been on the AIP diet for a month -- so really only eating plain fruits, veggies and meats with no spices. No coffee or alcohol either. It has seemed to help A LITTLE - but not much. I will definitely look into the Fast Track diet more though -- I appreciate it!