First, don't worry...all shall be well; just be sure to take your doctor's advice, particularly re: diet and exercise.
Second, do be certain to ask about medication interactions...throwing off the bi-polar will screw up the blood sugar and throwing off the blood sugar will screw up the bi-polar.
My prediction: a year from now you'll be posting pics of a slimmer, trimmer, healthier you...in a great new and smaller kilt!