Hi, I have a question for anyone to answer. I have been seeing a neurologist for migraine headaches and dizziness, off-balance problems, vertigo. He wants me to start taking a Medrol Dose Pack (steroids) I believe for 6 days. I have never taken any kind of steroids before. And, recently I ended up in the ER and found out that I have gallstones, so my doctor wants me to have Gallbladder surgery. My question is: How long does steroids stay in your system and will it effect me if I have gallbladder surgery while it is still in my system?