I have not had the problem (yet) with metoprolol which I take for a ventricular arrhythmia. But I do recall my cardiologist saying that after some time, the drug may become less effective. I have been taking it for over two years.

Metroprolol is the devil for me.....stopped my heart 3 times. lucky I was in the hospital at the time.

I do feel extremely tired all the time I wonder if there’s anything else with less side effects that works as well

Depending upon what you are taking beta blockers for there are others. The first go-round I was on bisoprolol which was extremely effective in controlling my arrythmia but gave me unbearable upper gi pain. And there are others e.g. atenolol.