I really limit the amount of time I spend in a store. The lighting is awful, there is too much stimulation and you will get sensory overload.

I also get really sick and dizzy from scanning the shelves looking for items.

Large crowds are hard, there are too many things to deal with. You also may find the same thing with conversations, I can speak with one or two people but once there are more people, I get really tired and trying to keep up is too hard.

My process know for the store is to walk in, go around the perimeter and pick maybe one aisle to go down. Unfortunately you do not get everything you need but you learn to make do.

Good Luck, it does get better, but try and limit your symptoms any way that works.