Hello, Froggymama, and welcome to the forum. I am sorry your brother is so ill.
Unfortunately, nobody will be able to tell you how much time your brother has left. The reason for this is that this disease is different with each person. Some can be in bad shape for years, but somehow cling on. Others decline rapidly.
You said your brother has other medical problems. That can also play into how well he does and how long he will be around. It's great that he stopped drinking last year...that is the single best thing he can do. However, there are other things that must be done to give him any kind of chance. First is diet. He needs to eat lots of fresh fruits and veggies and pure water. Meat should be at a minimum, and NO RED MEAT. The reason for this is that it is the most difficult food for the liver to break down, so with a damaged liver it can actually be toxic. He should be taking a daily multivitamin w/o iron, 500 mg of vitamin C, and 400 I.U. of vitamin E. He may need other supplements, depending on his blood work. That is something he should discuss with his doctor. Hopefully, he is seeing a hepatologist (liver specialist.) He should also limit or eliminate salt from his diet, as it causes edema and ascites (swelling in the belly from fluid.)
Do you know if he is being given Lactulose? If not, he should be. That is prescribed for those with high ammonia levels, which cause mood changes, hallucinations, being in la-la land ("out of it"), and even coma.
Lack of energy, fatigue, sleeping a lot...they are all a part of liver disease. I was diagnosed with chronic active hep C back in '93, at the age of 50. I also drank alcoholically for 23 yrs. (sober now for 22 yrs.) No matter how much sleep I get, it's never enough and does nothing for the sense of fatigue...which I can only describe as walking through molasses. I am also a liver cancer survivor. The cancer was caused by the hep C. Since cancer treatment, I do have a little more energy than I did while I had the cancer, but can still only do so much before I am "wiped out."
I hope that some of this information will help you to understand what your brother is going through. Was he ever treated for the hep C?
I know you will find a lot of support and info here. If your brother can get on a healthful diet, it should help him to feel better.
"But that was yesterday, and I was a different person then."
Alice in Wonderland, Lewis Carroll