First of all acidosis is a VERY RARE condition. All the hype about acidosis causing a bunch of diseases is nothing but sales hype. The body maintains its pH extremely well except in rare cases such as poisoning, severe COPD or diabetic ketoacidosis:
Unfortunately people buy in to the acidosis myth then really screw themselves up by trying to force their systems in to a dangerous alkaline state, which usually ends up also neutralizing the stomach acid. This leads to even more problems:
If someone wants to become alkaline really quick and see how dangerous it is just hyperventilate for a minute. Not only will this put you in to an alkaline state but you will likely be picking yourself up off the floor. Being too alkaline is just as dangerous as being too acidic, which is why the body has numerous methods to maintaining its pH in the narrow range it can live in. When people try to force their pH one way or the other they just end up putting more stress on the body as the body has to now wok that much harder to get itself back to the proper balance it was at.
As for ulcers they are not caused from excess stomach acid, nor a lack of alkaline reserves. Ulcers can be caused by the bacteria Helicobacter pylori (H. pylori) or by the use of nonsteroidal anti-inflammatory drugs (NSAIDs). H. pylori actually secretes alkaline ammonia to protect itself from the stomach acid as it, as with most pathogens, cannot survive in an acidic environment. NSAID induced ulcers stem from the fact that NSAIDs inhibit prostaglandins. One of the prostaglandins produced by the body is required to produce the stomach's protective lining. By inhibiting this prostaglandin the NSAIDs leave the stomach wall prone to damage by the stomach's acid.