You can write down how bad your GERD is now, how controllable it is now with medication, how long have you had it, you could have a hiatal hernia making it worse, you could have h. pylori bacteria in your gut, is it situational (eating late and then sleeping, only with italian sausage, only with spicy food, could it be the gall bladder?, eating until really stuffed, drinking a lot of citrus/soda pop, coffee, etc).
Your surgeon can do the EGD, and see what everything looks like and estimate the outcome to be favorable or not for the sleeve. Maybe your GERD is controllable, or maybe it isn't.
Don't let anyone badger you into the decision, make an informed decision based on what you know about your body. There are many factors dependant on your physical health now, your age, your genetics, whether you take medication, etc etc.
Asking forum members will get you 'everyone's personal opinion and personal experience', it really will not validate your decision.