Over the past couple days, I've been plagued with stomach issues. It gets so intense I feel like I could vomit but I know I won't vomit. It feels like there's a knot in my stomach and I can't get rid of it. I also have excess stomach acid and do take acid reducers. I seem to be burping more. And given the stress I shake a lot. I'm not quite sure what to do. It's giving me a lot of anxiety. It presented itself yesterday night and went away mid day yesterday and has come back tonight. It freaks me out because I have a phobia of vomitting. I need advice and/or opinions. I don't know if it's helpful to mention or not but I hadn't eaten in several hours prior to this on both occasions and it started out as a stomach ache that quickly transformed into nausea.