@martipants

I've had RA for over 25 years and being tired is just part of that , so it has always been hard for me to know if anything else is causing tiredness too. I don't think it increased my tiredness.
What I definitely have with it is very elaborate and pleasant dreams. My sister was on it briefly, it didn't work well for her, and she also had those kind of dreams. And in the 4 months I was off it it they stopped.

I did not gain weight on it.
I've had a few episodes of Raynauds, right before and in the first months after being diagnosed with RA which was a long time ago , +25 years. But, I've had none since.
When I first started Metoprolol, the tips of my fingers felt a little numb like I was going to have an episode of Raynauds, but that went away quickly , within a month of starting it.
I wouldn't stop or not take the metoprolol until you get all the cardiac tests your Doctor has ordered to give you a more complete picture of what is going on.