I'm taking metoprolol 50mg succ. (in the a.m.) for anxiety related sinus tachycardia. is it safe to take melatonin 3mg to help with sleep issues?

Usually OK: The most common melatonin side effects include: •Daytime sleepiness •Headaches •Dizziness Other, less common melatonin side effects might include abdominal discomfort, mild anxiety, irritability, confusion and short-lasting feelings of depression. In addition, melatonin supplements can interact with various medications, including: •Blood-thinning medications (anticoagulants) •Medications that suppress the immune system (immunosuppressants) •Diabetes medications •Birth control pills