high blood pressure. Why are you doing the joint destroying unnatural exercise that is the squat when you are just some random chump trying to get in shape to attract women? Just do a few sets of leg extensions and be done with it, nobody except people on the internet care what your legs look like anyway.
Wether or not you do cardio or weights on an empty stomach has no effect on how much fat you burn by the way, all it will ensure is that you are weak.