Hi Yammy,
That happens to me also. I sometimes think I never have a day when I feel well or I don't have anxiety. Going to the shops is one of my nightmares as I always seem to feel ill or dizzy but they do say the bright lights in shops and especially supermarkets are triggers for anxiety sufferers.
My best advice is to fight it. Although it's an overwhelming feeling, don't let it win. Go to the shops and then say to it 'I beat you, you ba*stard!
Have you tried Rescue Remedy spray? I use it a lot when I go to the shops. I think it's a placebo effect but because it worked for me, I'm happy with it. It's not a cure all for anxiety but I think for me it works for short term things like going to the dreaded shops.
Things that also work for me are to get a good nights sleep (not easy in peri), eat little and often, distract myself (I am much worse when I'm alone).
It's reassuring to see the amount of fellow sufferers.