PPIs seem to lower my blood pressure - and that gives me dizziness, especially when moving quickly from kneeling to standing for example (postural hypotension).
Additionally, it might be worth making sure you are not anaemic. I have reduced iron absorption because of the ppi (no stomach acid means you can only utilise the iron in meat not veg). However, GERD itself can cause blood loss, so it's worth ruling anaemia out.
New stuff: GERD, Recurrent cystitis/Overactive bladder
Lifelong stuff: Food allergies/intolerance, eczema, asthma