by Cynthia C. Muchnick, M.A., and Jenn Curtis, M.S.W. Picture a roller coaster. Not a small, beginner-level one but an epic, change-your-life, go-through-all-the emotions one. Envision one with the most stunning twists, the most jaw-dropping peaks, and the most stomach-churning drops. Got that picture in your head? Good, because those…