In the clinical trials for this drug, less than 3% of participants had to stop using the drug due to adverse effects. The three most common adverse effects were headache, nausea, and low heart rate. Other side effects were more rare or not as much as a problem to cause the need to discontinue the medicine.
If you are concerned about those lab values that you mentioned, your doctor can run a blood test on you after you start taking the medicine to see if any of the numbers are in a dangerous range. If they are, she will most likely discontinue the medicine, adjust the dose, or prescribe you something else for your high blood pressure.
Here is why bystolic requires caution for people with diabetes or thyroid problems: Bystolic is a beta blocker. Beta blockers may mask the signs of hypoglycemia or hyperthyroidism, because one of the signs is a high heart rate, and beta blockers lower your heart rate.