Whenever I take a new medication with intolerable side effects, I...

Whenever I take a new medication with intolerable side effects, I immediately stop taking it. Because Vivitrol is given in the form of a shot, the side effects will last the entire month that the drug is in my system. The chronic diarrhea and nausea have made me feel so much worse than I ever did before. I am so weak and tired and sick to my stomach every day. I am losing weight and my potassium is probably dropping to dangerous levels from the side effects of this drug. Why, so often is the cure always worse than the disease?