Hi Tracey72.
Unless you have some medical reasons, there is no reason why you cannot use Byetta and also use a low carbohydrate diet. This sounds very much like somebody putting their own 'take' on things. Basically, what your Nurse told you is NOT true.
There are many people on here who are on Byetta and who low carb. What Byetta needs to work properly is for you to EAT ! How and what you eat is your choice. It can be full of carbs, reduced carbs or even no carbs - just food.
As for diet and weight loss. Well, your Nurse again doesn't know what she is talking about.
I personally have lost nearly 4 stone since January on Byetta and drastically reducing carbs. There are many more on here who will tell you the same. Perrhaps your Nurse needs educating, give her this web address and tell her to read our Byetta thread. She just might then learn the true facts about Byetta and stop talking rubbish.
See the dietician by all means, nod sagely then go away and do what you know is best. Read the success stories here. If that doesn't convince you then try it yourself. You have only the weight to lose. It will also help you manage your Bg levels better too.