I`m being treated for lung cancer and acancerous lymph node. Having chemo and radiation. they said the radiation on the lymph nodes would cause problems with my esophagus. Now I have esophagial spasms and they are getting more frequent and hurt more , Dr. gave me sctipt for amlodipine besylat. Read about it and said not to take if you have a leaky heart valve and I do. cancer didn`t know that , so can you suggest an alternative.