Sounds to me like everything is hardly normal at all and you should go and get a liver biopsy to find out exactly what stage liver disease you are dealing with. I don't know anything about speens whatsoever but you need to find a heptologist not a regular primary care doctor and see what he thinks you should do about treating the disease.
Our livers don't really have nerves inside of them to feel pain. Which is why a liver biopsy is no more painful than an injection. Some believe that the actual capsule around the liver stretches when the liver is enlarged and that is what is causing pain. Some don't.
Whatever it is it sounds like you need to do something to proactively find out the cause and fix it, asap.