James,
Having a little girl has brought out the underlying fears felt by all fathers. It will get worse as she gets older and boys are involved
What you have is an extreme Anxiety due to the overabundance of Love. It IS controllable, but you need to open up your thoughts and fears to a Therapist and talk them through. It will not be easy, and your 'Trigger' is just as valid as mine of people, phones, eating, Therapists… But you go in armed with one 'Trigger' identified, there may be more you are suppressing.
Have your tests, have your bloods done and all your levels checked for an obvious cause of the cramping as Caroline suggests, but expect to be around for a long time for your wife and daughter.
Dave.