I have been taking prednisalone for over three years now to treat my Asthma. The dose has been varied, when I have flare ups I increase the dose then reduce it again when my Asthma symptoms settle down. For the past 4 months I have been experiencing a dull headache at the base of my skull which can spread round the side of my head and to the top, I have also been feeling a bit off balance, almost like I have been on a boat in rough seas, The Doctor says the type of dizziness Im describing is vertigo. I have been experiencing this most days for 4 months now and am desperate to know if these symptoms could be a result of prolonged use of prednisalone despite me using them for years and have never experienced this until approx 4 months ago. Can side effects like this appear after years of constant use?