Hello,
obviously you are having a problem tolerating byetta, and given that this is now 3 months and you have lost so much weight, I would think it may be rational to ask your doctor if you can stop this
medication and try something different?
Why did your dr. not decide to start you on Metformin?
Have you been monitoring your blood sugars (while on byetta)? What is your fasting and post-eating blood sugars. What was your Hba1c when you started this med?