Hello Paul, I would suggest that this is the time to check for better options. I can't say that your IMRT plan was much different than standard in terms of what was going to be radiated, but if you can get IMRT you should experience less long term effects, and in some cases this difference is huge (like no saliva ever again versus having a good amount of saliva within a year). The fact that they simply changed your treatment to suit their schedual is a red flag in my mind. You have other options nearby, I think you should pursue them tommorow.