Topril xl symptoms and conditions

I'm a 43 y/o male, on Toprol-Xl (25mg) and Diovan(80-mg) for high blood pressure. I've been on Diovan since it hit the market (no side effects at all) but recently developed a fast heart rate with no explaination. I saw a cardiologist and he put me on 25mg of Toprol-XL once each day.It's been 7 weeks and I'm fairly well adjusted with few minor side effects (slow pulse, cold extremities, weird chest feelings when the Toprol starts to wear off) and a major side effect (lack of sleep and weird dreams).

I read an article that Toprol-XL is time released and the medication has it's peak affect 8-hours after taking the dose. I was taking the medication with dinner, but would then wake up at 3:00 am, wide awake, couldn't fall back to sleep. I now take the medication with lunch and my sleep patterns have improved considerably. My incredibly, sometimes scary, dreams have tapered off too. My blood pressure is picture perfect (usually 115-125 over 70 to 80) and the bursts of rapid heartbeats have stopped altogether (I had an echo stress test, echocardiogram, blood work, 3 EKG's) and all were normal. My cardiologist said all my side effects are normal and that if i couldn't tolerate them he would switch my beta blocker.