Metoprolol Succinate ER causing worse mental issues ?

Wow, I have a very similar story. I have been diagnosed with Bi-polar II Depression quite awhile ago and have been more-or-less successfully treated for it. In Oct. 2019, I have an artificial hip replacement revision. I was in the hospital for a week and then a Care Center Rehab Unit for 3 weeks. I took me forever to recover, which is strange because I recovered quite quickly from bi-lateral knee replacements in 2002 and right hip replacements in Aug. 2009 and left hip replacement in March 2013. My right hip replacement is the one that failed a year ago October. With this new revision, I just couldn't recover. My blood pressure bottomed out and I was exhausted forever it seems. I had been taking 50 mg. Metoprolol Succ ER Tabs for a very long time to treat a mildly elevated blood pressure when I had cancer. My doctor kept me on these meds even after I recovered. So, similar to you, it was discovered in April of this year in the results of a normally scheduled lab work up that I had Congestive Heart Failure. No signs of ever having any heart issues, so the assumption is that I contracted a heart virus as a result of the hip revision and stays in the hospital and care center. My doctor ordered an echocardiogram and ekg, where it was discovered that I also have a severely regurgitating mitral valve. Again, no prior indication of this. So, long story short, I was referred to a cardiologist in Reno NV who performed specialized studies of my heart, which revealed that I have Class C, Stage III Congestive Heart Failure that just suddenly appeared. Also, the severe mitral regurgitation was considered a serious problem. I subsequently had a mitral-clip procedure during which the surgeon place two mitral-clips on the Mal-functioning heart valve. Now before all of this took place, I felt like a dead woman walking. It was awful. The Cardiologist took my metoprolol down from 50 mg/day to 12.5 mg/day immediately. And a it made a substantial difference in how I felt... better. And after I had the mitral-valve clip procedure, I'm feeling alive again. I have color in my face, my memory has improved, and I have much more energy. I still am dealing with the Congestive Heart Failure, which continues to hinder a full recovery, but I'm feeling better everyday. I'd say it's because of the reduction of the metoprolol and mitral-clip procedure. My vitals are now stable and are not dropping way down. The 50 mg of metoprolol was just way too much. For a very long time, my doctors and family thought my fatigue and difficulties were a result of the Bi-polar Depression, but this was not the case. It was my heart. I don't know if my response will help you because we have different, albeit similar, circumstances. I certainly hope so. Stay safe in this crazy time and be well.