The fact that Liver Flushes make you sick is actually the sign that you need to do some liver cleansing. If you feel a full flush is too hard on you at the moment, you can consider drinking beet juice daily and doing coffee enemas.
Also, you mentionned your problems started "one year or so post removal", but you also say that you were deathly sick before the surgery, which is kind of paradoxal. The removal of the GB didn't make you sick, you were already. Of course you got sicker as time passed. But you can get healthy even without a GB. Some have done it.
So, clean your liver, clean your colon, eat as healthy as possible, and you should be able to regain your health.