I get dizzy often, too. Didn't connect it to the fibro until now!
I understand your frustration about
forgetting things and buying things you don't need. I never go shopping without a list anymore. That way I am pretty sure that I will at least get the things I need ;-)
If walking becomes very difficult for you, try using one of the motorized carts that some stores have. I know Wal-Mart has them.
Do you wear sunglasses in the sunlight? I know that I need to wear sunglasses year-round. The polarized ones work the best for me.
I am a big fan of on-line shopping
I even do my food shopping on-line when I get really busy and can't findthe time to go to the store myself.
I hope I've helped a little bit.