The other day I was in Costco and around 30 minutes in I started to feel quite light headed and kind of spaced out. It felt like when you are zoning out and day dreaming except I couldn't snap myself out of it so was walking around in this day dream-like state trying to navigate my trolley around people that I could see but couldn't focus on if you know what I mean. I soon forgot about it as soon as I was outside I felt normal again.
Then a couple of a days later I was in Tesco. Again, I was fine for around 30 minutes and then started to get the same zoned out kind of feeling and start to be a little irritable as I want to hurry up and leave. I am ok and both times the family members I were with did not notice anything I just felt a bit slow when trying to navigate the trolley around people and the aisles and when packing the shopping at the till. Again, as soon as I left I was fine.
Since then I can recall feeling like that in Ikea and sometimes when clothes shopping in, e.g. Primark. However it is always in shops I am in for quite a while and is around the 30 minute mark that I start feeling like that.
I think it may be either a reaction to the fluorescent lighting or perhaps nervousness at being in crowded shops? I was wondering if anyone else ever feels like this?