can i take bendroflumethiazide if i have always had low blood pressure

none i think

Yes, bth medications shouldn't interact, however if any allergies are recorded from any of these two should not be taken.

i also take nadolol and have experienced vivid dreams and lucid dreams, my dreams are not scary or bad more weird & crazy... Hopefully you stop getting awful dreams. as for talking in your sleep i have no idea

There are a couple of beta blockers used as migraine preventatives.

Propranolol

Atenolol

Timolol

Nadolol

..are the most common used.