Light Headed during Excercise

I am on lisinopril for hypertension (have been for 2 years) and paxil for panic/anxiety (6 months).  I have been working out for about 1 hour daily doing both weights and cardio.  The last couple of days while I have been working out, I have felt very light headed.  This only happens when I am on the ground doing core training and then get up to do something else.  I feel very woozy and I have stand still for a minute to get my senses back.  What could this be?  My blood pressure is monitored weekly and it has been fine (128/85).

[Douglas Bogart, MD]

It may be that with the increased intensity of your workouts you are somewhat dehydrated and with the vasodilation that occurs with exercise your blood pressure drops producing the symptoms