For the suspected low stomach acid you take betaine hcl and slowly ramp the dosing until you feel a slight burn, then you back down a little and this is your correct dose. You might need a LOT more than you are taking currently.
Also helpful is more salt in the diet, ginger, apple cider vinegar, beets and lemons.
The third macronutrient you left out was fat. Try butter, coconut oil, cream, animal fats like beef, duck, chicken, lard, avocado, and high quality cold pressed seed oils/olive oil.
Start with coffee or saline enemas and one or two castor oil purges. There is a whole cascade of interdependant hormones involved in digestion starting with the stomach, then triggers for the gall bladder, pancreas, intestinal enzymes, etc. It's a given your liver is congested as well.
Look into Ray Peat,Larry Wilson for different dietary strategies.
Iodine protocol for cysts, but start slow and stop if anything bad happens.
Liver cyst = high chance of parasites.
Probably you're also hypothyroid and hypoadrenal, get your body temperature above 98.6 consistently by any means possible.
I suspect saturated fat will be your friend for now and help you get to a non-starving state of being.