First you need to eat. I suggest you start with lemon juice from half lemon in half a cup of warm water and drink this before each meal. If raw foods are giving you bloating, foods are not digesting well then cook your food a bit, steam carrots and cucumbers, broccoli, etc. You need to increase food intake slowly. Evening meal can be soup made with potatoes, tomatoes, spinach, rhubarb and add what you desire.
Masticate your food to a slurry, eat your soup like your eating solid foods, saliva needs to mix with your food.
After two weeks you can take HCL Betaine supplement with meals. Apple Cider Vinegar will help to build stomach acid as well.