Boot size problems

Hey guys, this past season i bought a new pair of boots from my local shop. There was a boot fitter and all. The first day i skied in them i could do 3 runs without unbearable pain. So this started the process of taking the boots off every few runs cause i couldnt feel my feet and the pain was so bad. I thought that this would only happen the first couple days of skiing cause i thought that i was breaking them in. I dont think this is the case though, because after 10 days of skiing in them, i have the same pain. I need some advice on this, are the boots too small? did the boot fitter mess up? thanks guys, input would be nice!