I had/have another condition , but what you describe fits how I felt at times.

It was like there was too much input coming at my brain all at one time.

In stores the bright lights and colors and noises.

At a family gathering or any get together I had major trouble pillowing the conversations especially if there were other talking nearby.

I understand what you are going thru.

It's very disconcerting to realize you can't multi task like you used to, but in time it may come back.