I had the same issue with the protein shakes ( upset stomach). Cornstarch at bedtime help hypoglycemia ( overnight low blood sugar).
Now I bought protein powder and mix it with yogurt and kefir, instead of milk and tolerate it much better! Goat cheese ( not too salty) on crackers or toast is a good alternative for protein and calories; cottage cheese with fruits as a snack. I " lived on overnight oats' for the first week - easy to make and available in the morning ( oats, almond milk and yogurt in the refrigerator). After that I started adding fruits and Walnuts!
You rock, Michelle! Keep it up!