Bex, sounds like a bad systemic bacterial infection at least. The bacterias give off ammonia. Your symptoms seem to be ammonia-related, I bet you also have chest tightness, and wheezing. Have you talked with your doctor about this possibility, or checked blood ammonia levels?

Our bodies are used to ammonia, because it is formed from food, but too much is too much. There are some supplements that help in detoxing ammonia, but I suppose you don't have the money to buy them.