Ggreg has provided an excellent analysis of your problem, to which I have nothing constructively to add.
I will tell you that you have a life-threatening problem that requires a look-see by a wound care specialist. As of three minutes ago. This does not mean "call and get an appointment".
It means leave enough food for the canary, leave the cat with a neighbor and like the Jedi DO!. Head for the nearest emergency room.
The problem you describe has a tendency to go bad - as in extremely bad - within a short span of time. Amputation of the foot, then the leg, and death are common outcomes.
You will be treated at any hospital in the United States regardless of the ability to pay. If you require long-term care, look on the internet for a Hill-Burton facility in your geographical area.. These hospitals are required to treat without regard for ability to pay.
Well, I do not believe this is a neurology issue. Since you don't say what caused all this other than the contributing factor of liver cirhhosis, this sounds more like a diabetes problem or circulation issue, which is rather serious, particularly if the feet turn black anywhere. However, I have to assume you've visited a doc, and if so, you must go back and explain how the feet are getting worse and yellow fluid is coming out. You asked what's going to happen if this continues, and, depending on what originally brought all this about, you can actually lose function in the feet or face amputation. You asked what else you can do to help the feet, and while common sense home remedies might provide better healing and relief, I have to point out that since the chance exists for your feet to get much worse, I think your family physician has to be the one to direct your treatment, because what seems an innocent thing to do to feet like yours, might make them worse. If you cannot afford a regular doc, since you did not say what he advised, you can go to the county health department and they will take over the care of your feet. So, in sum, you must go back and see a doctor.