Do I need to rush to the ER or wait two weeks to see my gastroenterologist?

Hello doctor,

A recent abdominal CT scan at the ER for a possible kidney stone was normal in every respect, except radiology report stated a very slight 'thickening in the stomach lining'. I had a normal endoscopy three years ago, which diagnosed a small hiatal hernia, but no other clinical findings. Colonoscopy was completely normal. I was told to come back in 10 years and that they thought I had IBS. I have been so stressed out about the 'stomach lining' issue. I cannot see a gastro for two weeks, but he called and said he thought it was nothing, and that he sees this a great deal on CT scans. Shortly thereafter, after shaking and hyperventilating from worry, I had an intense bout of diarrhea, 10 to 15 times a day for six days. The only other symptoms were hypermotility and mild nausea. I lost 5 lbs., but the weight is returning now diarrhea has stopped. Solid bowel movements are slowly returning, but in small amounts and somewhat thin, with some cramping after. Should I try to get to the gastro earlier or go to the ER again? I am so frightened and confused. Thanks for your input.