Isosorbide mononitrate symptoms and conditions

I was on toprol-xl for almost 8 years without many problems. i also take isosorbide mononitrate.A few months back I was switched to the generic version (metoprolol succinate er by sandoz) now i have many problems.First I have to say I am disabled with severe COPD. Although I do not feel depressed I have a lot of symptoms of depression. Remember I had no symptoms what so ever until switched by Walgreen's or HMO or Doctor to the generic version. Not sure what to do I have a doctor that does not truly listen,plus he did not want me on toprol xl to begin with. Even though it was good for me. Good luck people!

low blod pressure,dizzyness,hip pain,pain injoints on hands ,swelling of knee joints and pain,frozen shoulder on left side also taking other heart medication
ramipril,isosorbide mononitrate,warfarin,metoprol,zoton,frusemide,beclametazone, ventolin,ipromiom bromide,g.t.n spray,atorvistatin
i also have asthma