Hard to say and I'm not a doctor. But I do get lightheadedness, and in me it's been called vasovagal episodes. But I've also got considerably lower blood pressure than you do.
Maybe ask for an EKG. They might want to give you one anyway, due to the palpitations. It's not necessarily bad (I've been told that what I've got might be a little alarming, but it's not dangerous. The same may be true for you), but either way, it's better to be sure.