I agree with Rosebud about going to a Gastroenterologist. I'm also a RN and I've had stomach trouble for over 20 years.

It does sound like you have an ulcer or severe gastritis. For proper treatment you need to have proper diagnosis. I think, in addition to being scoped, you should ask for a barium swallow. If you have trouble swallowing, ask for a barium tablet during the test, not just swallowing the liquid. The tests themselves are not that bad....they're improved the taste of the barium and they pretty much knock you out for the scope. I'll occasionally remember snipets....like the doc talking, nurses moving me, etc. Believe me! I had all the done over 20 yrs ago and the improvement in technique has made thing a lot easier!

When my stomach problems first started I was treated by a GP (internist) for over a year before going to a specialist. I was newly married, just bought a house and in a very bad job situation. It got to the point where I was vomiting several times a day, lost over 30 pounds and was having trouble swallowing. The first thing the GI doc did was a GI Swallow and a Gastroscopy. No ulcer, just really severe gastritis. The trouble swallowing was due to strictures caused by all the vomiting. Since then I've been on almost every stomach med there is....and the only thing that works is Prilosec. H Pylori is not present with me. It's all sensitivity and complications.

My advice?
Stop coffee, tea, all alcohol, and carbonated beverages. Also be careful with food and drink that's very hot or very cold.
Spices, tomatoes, chocolate, wine and butter (yep, but just during a flare up, and if it bothers you) as these can relax the muscle between the stomach and esophagus, increasing reflux and symptoms.
Try white pepper instead of black...weird, I know....but it really does make a difference! Twenty years ago, I couldn't eat any black pepper! White didnt' bother me. Now I just have to be careful, but always keep white in the house. I love pepper, but use it sparingly. If I make something or want something that calls for a lot of pepper I use white only.
Raise the head of your bed 30 degrees or try sleeping on several pillows so you're partially upright.
Eat small frequent meals. Try to keep something in your stomach as much as possible....but dont' eat within 2 hrs of bedtime. Avoid raw fruits and veggies....at least until you figure out if they bother you. Dairy products too. Calcium supplements, like dairy, can cause an increase in acid production, so you might want to hold those supplements for a while.
***If you have heartburn, or other pain that is relived by antacids, take the antacid! Be aware some can have a laxative effect....but otherwise they shouldn't cause any problems. The more pain you have the more potential damage. If the antacids work it's because they're temporarily soothing and repairing the inflamed area.
Take all meds (except stomach med) with food. Avoid all Asprin, Motrin, Celebrex, Vioxx, etc if at all possible. If you must take someting, make it tylenol. If this doesn't work, change your choice of med. (I can tolerate Motrin at 800mg 4X/day....but Vioxx, Celevrex, etc all destroy my stomach!) Ask your pharmacist about any meds (prescription or OTC) to see if any are known for causeing stomach trouble.
Do avoid all sugar and refined carbs. This is known to "feed" HPylori and causes an increase in acid production. The doc I see, formerly from Duke, said that after the study done there the doc in charge told him that almost all the patients with stomach troubles had relief on Atkins....and the ones that went off the plan at the end of the study complained of rapid return of all symptoms. The doc is now considering a study on the effects of carbs on patients with stomach problems.
One exception to the carbs. One or two saltines or a small hunk of bread can (and I think should) be eaten if you have heartburn and no antacid available. Again....the crackers will absorb the acid in your stomach and thereby help prevent further damage.
Drink plenty of water.

Good luck and keep us informed! I'm sorry you're having so much trouble right now! I don't think it's the low carb diet that's the problem as much as it might be some of the foods your eating now that you didn't in the past.

Cindy