I am 31, female and bmi 33, i was told i have optic nerve head drusen and now consulant is saying it might be intercranial hypertension, i think she is right, i am waiting for scan at the mo, but i get whooshing in my ears and headaches so i think IH is right, this is worse when exercising, i need to lose weight, how can i safely exercise with intercranial hypertension