I do think he is incredibly insecure, and is wanting my full attention.
This is a major thing that caused xH and I to fail. Work on this. Not saying he needs your full attention, obviously not. But he needs you to need/desire him. You can do it together. I think he'll need you to initiate the communication, but especially the validation!! The validation that he is loved, needed and *desired* (very important).
So sorry about S3, but at least you'll have meds to travel with. They (you and everyone!!) will be feeling better. Enjoy, enjoy, enjoy!