weakness of hands and legs

im a 66 year old female  and the past  2 weeks my arms and legs  feel very weak and im  feeling  very fatigued .i currnetly  am  taking  actonel for my bones  the past  3   years   and klonopin  i per  night   and  take  alot  of vitamins such as  B compex   etc.    no  alcohol  consumption   but i  do  smoke  half a pack of cigarettes  per  day   no other  medical  conditions  known   6 months  ago  all  my blood  workups   were   normal  .    ANY IDEAS   WHAT  CAN BE  GOING ON  WITH ME ?    THANK  YOU

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