How to lower my sugar after a steroid shot?

C
I have gd but my highest reading (and I test 5 times a day) has been 173. I had to have a steroid shot done. Which the doctor and nurses said it would give me high readings. So after eating two hours ago my sugar is 217. I'm about to go to bed. How can I lower my sugar before I hit the hay? I'm drinking a crap load of water right now to try and help. Any other suggestions?