Thank you again for the explanation . The Metoprolol seems to be working , are there any long term detriments to taking it ?
Not normally, like everything, it can have odd side effects, but if you are not having them now, then you probably will not have them.
Some people feel tired on it, but that is different for everyone. With feeling tired, some people gain weight. Sometimes it doesn't get along with asthma very well, but it is one of the beta blockers most likely to be ok with asthma. Some people have periferal circulation issues on it, but that shows up pretty quick and is not subtle (if you haven't already noticed an issue, then don't worry about it).
Some people loose the top end of their athletic performance, as metoprolol calms down the electrical system it also slows down the normal heart rate and if you cannot get your heart rate as fast, you loose that top capacity. It really depends on the person though, most people never notice this, including athletes. But, the higer the dose needed, the more likely this is (max daily dose is 400 mg, rarely is anyone on that).
It becomes a trade off. For example, if you feel good most of the time, and can still do most things you want, but notice a decine in sprinting ability, it probably is not worth switching to a high risk medication like amiodarone or having an ablation. However, if being on metoprolol makes it were you cannot do things you value, then you might find it worth the risk (but that should be discussed with a provider who's care you are under).
Sometimes people end up with a electrical heart rate that is too slow, normally this corrects once metoprolol is stopped. Rarely someone needs a pacemaker.
When you compare that to say amiodarone, which needs labs and an EKG ever 6 months for monitoring and can cause life threatening ventricular issues, life threatening liver failure, pulmonary fibrosis, and skin permanently turning blue/gray or an ablation which being invasive and requiring the intentional distraction of heart tissue has a risk of creating problems and doesn't always work, I would go with metoprolol (or another beta-blocker or calcium channel blocker) as long as possible. You may never need anything more, unfortunately no one has a functional cristal ball.