Medicine causing side effects

Well yesterday at Austin's appointment we found out that he has gained 10 pounds in 2 months...not good news and we are concerned that this could potentially go into diabetes.  But we know that taking him off of the medicine that is increasing his appetite is not an option, we tried that and it did not go well.  Major meltdowns and mood swings.  So our only options are to force exercise and most likely he will have to take another med that will help with controlling the insulin concern.  I hate having him on so many medications!  He also needs another blood draw to make sure he isn't diabetic already.  These are never easy for kids let lone ones with major sensory issues and anxiety.  Hopefully I will be brave enough for both of us.  Please send positive thoughts our way.  Thanks.