Yeah seroquel is not the best choice if you have problems with blood sugar. If you are actually bipolar then 25mg is not enough for mood stabilisation. What have you been on to keep you stable all these years? The heart stuff can happen with any psyc meds, nothing to be worried about if they cleared you previously. Adderal would make the hearts skipping beats worse and can cause more problems.

For sleep have you tried actual sleeping tablets? As curiosity suggested. Much better option than an AP for someone like your self. Just dont get hooked. Do you have good sleep hygine etc? Thats where the pdocs focus should be before dishing out drugs. What do you do to manage your anxiety, besides meds?