I am sure that many here may have experienced similar difficulties finding the right med. So many Meds and each of us react differently to them. I think it helps to not convince yourself that a new med will fail even before you try it. I do like that my Neurologist and I have decided to team up and discuss choices and options and with me being given the final choice.
My first med was Verapamil 120 SR. Worked very well for a month or so but then had many breakthrough symptoms. My dosage was doubled to 240 and within 2 weeks I started having Gum problems that had no obvious reason except for the Verapamil. This is a unusual side effect to have, but sure enough it improved after stopping.
I was given the option of Nortriptyline or Gabapentin. I am on Nort @ 10mg and doing pretty well 3 weeks in. No side effects. Does seem to help with sleep when taken in the evening. I am due to possibly titrate to 20mg soon.
Listen to opinions of fellow forum members but try to decide with an open mind and hope for success.
Good Luck dizzyhead.