I'm sorry to hear about the problems you've had, but I'm delighted to know that you've found some relief. For many patients, wearing glasses masks the sort of convergence/divergence issues you describe. After surgery, without the mask (spectacles), these problems become apparent, and vision therapy is advised.
It is not the least unusual for surgeons/ophthalmologists to tell us that there is nothing wrong with our eyes, or that it's all in our heads. They have no idea what's going on, they don't want to know or have any idea, and so they tell us we are fine, the flaps look great. This is why the vast majority of our network resources are optometrists, who understand vision science and how our visual systems work.
Hang in there, and please do report back with updates.