I started taking Serevent alongside my Becotide about 7 weeks ago as I was having to use my Ventolin quite a lot so my doctor wanted me to try something longer acting. It's worked wonders for my asthma, but for the past 3 weeks I've had a constant headache, dizziness and nausea. My doctor thinks there's a possibility the Serevent is causing this (although she is testing for other things). I just wondered if anyone else has had this, is it particuarly common? I'm not taking my Serevent for a week (on my doc's advice) to see if it helps, so I should know soon enough.