Hoping, I haven't needed a transplant yet, thank goodness. My liver (or what's left of it) is functioning pretty well, although my enzymes are a little elevated due to the hep C. The cancer had metastasized to the inferior vena cava (large vessel), so I wasn't a transplant candidate at the time I had cancer. The treatment I received shrunk the tumor and the part that had metastasized, so they then removed the entire rt. lobe and gall bladder.
The irritability you mention is likely due to your dad not drinking. You have to remember that he was drowning his emotions and now they are surfacing. I remember that first year being difficult because little things would irritate me. I also had trouble sleeping the first 6 mos. or so. I had always had booze to turn to when I was anxious, when I was hurt, to lift my mood, etc. When it was no longer there, I didn't have the skills to deal with "life on life's terms." That is what AA teaches, through their steps. Your dad is getting something out of it, even if he's not talking. But it's going to take him sharing in meetings and with his sponsor and actively working the steps for him to become the person he is meant to be. If he is just "putting in time" because he has to, he will either return to drinking or just be a miserable sober person.
The other thing that can be causing mood swings is an elevated ammonia level, which causes hepatic encephalopathy. You can read about this in the Hepatitis Resources folder. However, if he doesn't seem "out of it" or forgetful, etc., then it is likely just his adjusting to life without alcohol.
Some alcoholics are very good at hiding the amount they drink. My dad was a closet drinker. He ended up committing suicide. My mother was an alcoholic who never got sober until an advanced age when she went into a NH. By then, her brain was gone. Of course, with this genetic disposition to alcoholism, I should never have drunk alcohol at all. But I thought I could handle it. Ha!
Your dad will receive Medicare in about 2 yrs., if he lives that long. Hopefully, he will get the transplant he needs.
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"But that was yesterday, and I was a different person then."
Lewis Carroll, Alice in Wonderland