Hi Sal, 
I know exactly where your coming from!! This was my first ever clinic where I didn't get exactly the same reaction that you described.  It's horrible.  I'm sure to them it sounds so easy!! I've just started a trial of lowering my carb intake and seeing how I geton with that.  Fingers crossed.  So far so good anyway.  I know it's easy for me to say to you but I promise you, I know what it's like and try to keep positive.  We can't keep letting them win!  
If you ever want to talk, feel free to PM me. 
Take care 
Marie xxx