Can TIA's be mistaken for silent migraines?

In the past 12 years I have had painful headache migraines.  I am a 65 year old female.

For the past 3 or 4 years I have had TIA symptoms: broken speech/ trouble finding the

correct word/ using the ending word of a sentence with a word that is totally out of con-

text/ slow speech/ going blank before speacking; Imbalance problems:  staggered walk,

bumping into things, can't walk a straight line, sway when I close my eyes standing still;

The attacks do not appear to be on one side.  I talked to a pharmacist recently and she

wondered if these might be silent migraines.  I have had MRI's, neurological testing by a neurologist, heart testing, etc.  Nothing can be found in all of the test.  My primary physician says she doesn't know what is causing the attacks although she believes it is nothing serious because of all the testing she has done.  Is it possible she has overlooked

the possibility of silent migraines?  I have quit going to the hospital and calling an ambulance and have just gone to bed.  The imbalance has continued from 3-30 days.  The speech problems go away within a day.  My ENT has checked me also...nothing.

thanks.  Jackie