I am taking 50 mg of Topiramate to try and help with migraines which hasn't worked over the past 10 weeks. I recently started taking 20 mg of predirsone each morning for 5 days to see if it helps. I have been taking 1Advil liquid gel 400 mg which did work when the pain was really bad (2-3 times/day). Now the Advil is not working and the pain is even worse since I started the predrisone. Is headaches a side effect?