Thanks for following up. I figured your concern . Dizziness, headache can be symptoms of TIA, ischmic stroke in vertebrobasilar pool, vertigo, 
osteochondrosis of cervical part of 
spinal cord. 
  For dizziness you can use 
Betahistine Dihydrochloride  16mg -1 tablet trice a day.Please control her BP, Nifedipine(20mg) is used to lower 
hypertension.
  Give Pentoxifylline( Flexital  , Kinetal, Trental) -1 tablet 3 times,it  can reduce blood viscosity and also improves microcirculation and peripheral tissue oxygenation.uction, called 
pilocarpine hydrochloride may be prescribed.
 For improving saliva I recommend:
-Humidifier to add moisture to the bedroom air
-Sucking on sugar-free lozenges or chewing sugar-free gum
-Keep her hydrated with plenty of water,it will aso help keep mouth moist
-Try to breath through nose, not mouth.
  Take care!
   Dr.Sagar Gaurav Shrivastva