Colonics will seriously deplete minerals - I know it from personal experience. You MUST remineralize otherwise the liver will not work correctly. It is going to stay in 'stress mode' and flushes, further colonics and symptoms will all be worse. Be sure to eat well! Most people with blocked livers have protein deficiencies. I know that when I started eating well ( good quality fish, chicken, eggs, cooked vegetables at first (raw is stressing the liver when it is weak), oats, nuts).
I was also really helped by liver herbs, which I started to consume very gradualy.