thanks for your comment i also had scan of the inner which was clear
I did see your message but I have no idea what to say. Your BP doesn't seem that low at 110/70. You say you have been to a specialist for vertigo? Sounds like you obviously have some vestibular problems but they haven't pinned it down yet. Did they try you on a medicine for vertigo to see if it helps? I have a friend that takes a med for her vertigo and although she still has occasional episodes, the med has helped her tremendously.
I do hope someone who's had bypass will share their experience.