Trouble concentrating, memory loss, other thinking problem, passing out, light headed, spotty vision and dizziness...What could be causing this?

Many possible causes. There are many possible causes for such symptoms. These include include drug and/or alcohol use; neurological causes such as head injury, migraines and seizure disorders; anemia, heart arrhythmias, etc. Anxiety can cause these things too. There are many more medical causes to investigate. It's important that you see your doctor as soon as you can, so you receive the kind of help you need.
See your Doctor. You should consult your physician asap.These symptoms can be a manifestation of some serious problems. In the meantime stay well hydrated.Avoid caffeine , alcohol and smoking. It can be the weekend syndrome as i see a lot of these cases in my urgent care practice but that can only be said after the work up is negative for other life threatening illnesses.