Anxiety is driving me crazy

That's great! That's the type of attitude you need when going through something like this! 

Instead of driving yourselves crazy stressing take that time to read all you can here about your surgery, practice not drinking with meals, practice taking small bites, chewing well and waiting in between bites. Start walking even if it is just around the house. Look up healthy recipes here and on other websites. Look for high protein low carb ones. The better prepared you are the better your post op life will be. Good luck all!