I agree with Happyhorney that you should see a neurologist. it sounds like you are having Absent Epilepsy seizures. They are somewhat common among young people and most outgrow them.
You should see a neurologist
That sounds scary and stressful. It is the kind of thing that can be difficult to diagnose. In my opinion, it could be neurological, psychological, or both. I do wonder why being in jewelry stores is a trigger. It's tricky to try and figure out these things on your own. If it's psychological, it could be a bad idea to dig into it alone. If you have been, or do explore that, stop and talk to a doctor if it becomes too stressful or gives you more spells.
So, if you can, set an appointment with your primary care doctor (they'll probably have to give you a referral to see a neurologist, if they think it's appropriate). The primary care doctor may suggest seeing a counselor of some kind. If so, try to get as much information about a possible counselor as you can by asking your doctor, family, and friends for recommendations, and looking for online recommendations. There are some really great doctors and some really not-so-great ones; for this, you want to see a Great one. If possible, see a psychiatrist or psychologist instead of a general therapist or counselor. Psychiatrists and psychologists have better training.
I hope you're able to find out what's happening!