I Was Diagnosed With Anorexia Bulimia And I Currently Have

I was diagnosed with anorexia bulimia and I currently have a potassium level of 1.6, my potassium levels are forever changing because of my diagnosis and I've been taking Sando-K tablets 4 daily, they are not bringing my potassium up by much is there anything else I can do? Any other suplaments? Obviously potassium is life so I am very concerned.