Metoprolol Succinate is NOT meant to be taken twice a day. It is a time release pill that should only be taken ONCE a day! Metoprolol Tartrate is taken typically twice a day. Same drug, same strength, but the Tartrate is not time release. You should contact your pharmacist and physician to get this sorted out. You're taking 50 mg. in the morning, and another 50 in the evening while the other 50mg is still working. If you be taking 100mg per day, then take a 100mg Metoprolol Succinate ONCE a day.
By the way, Metoprolol Tartrate taken twice a day is pennies per dose compared to the Succinate version. Just something to keep in mind.
Sorry, but I can't address the Neuropathy problem.