Sorry to hear you are struggling so. Were there sounds at the small shop ? How about a busy visual environment ?

What diagnostic have you sought out ? Do you have an appointment with a vestibular specialist scheduled yet ?
How about a neuro-ophthalmologist ?

It does no good for you to worry and fret until you have been properly assessed by these specialists. Then, after a diagnosis and treatment for 6 months or so, you will have a better idea of your future.

You are still very early in the process. We have had many people on NT who have struggled for a year before finding the right help and treatment.

Over-stim problems are something you can work on without a professionals help. Have foam ear plugs handy all the time. If you want into a store or other environment where you get a glassy eyed or spaced out feeling, at the very first sensation, head for the door and a safe environment. Do not try to overcome the stimulation. Avoid it.

Also, learn to look around by turning your shoulders, not your neck. If you have unresolved neck issues, turning your neck will likely make things worse. I had to learn completely new scanning skills for going into my backyard to clean up after my dogs. Turning my head at the shoulders made all the difference I needed.

I always have a hat and tinted glasses. They are my life saver.

Take is slow. Try to be patient. You are still young and have plenty of time to recover and start a life.

My best to you.