Increased palpitations

I was diagnosed with HCM a year ago, they have me on metoprolol. How often do you check to see if its better worse, I have recently been having more palpitations with a couple times become very dizzy. It doesn't last but a second or 2 but im very concerned. I have ambetter insurance in kansas which is the bottom of the barrel and I don't want to not do anything about it. Please give advice. I have lost weight been taking metoprolol 25 twice daily so why all of a sudden is this happening