I understand how you feel. I am struggling to be inactive, even with all that is going on with my back. I am a bit better, but like you, I am a planner, and all I can think about are the cycling obligations I have, along with the fact I have hardly any riding under my belt and my trip is in 8 weeks. I can easily give up the gym stuff, as per my doctor, until I find out what is going on, but I can imagine how you feel, with your summer trip all planned. At least you will be with a familiar doctor.
It sounds like Murienn's experience was pretty positive in the end, for a similar injury. I'd say try to focus on healing, enjoy your time with your mom, and don't predict the worst. Our brains are programmed to do that, so it is a fight.