Anxiety causes all of the things you're describing. My 5 year old was in the hospital for 5 days last week and it was EXTREMELY stressful. You would have thought I was wasted all week by how little I was able to focus on things, how forgetful I was, how lightheaded and detached I felt, etc... I made wrong turns on my way to and from places I go every day, I left home without my wallet, I forgot words and lost thoughts mid sentence. Stress and anxiety has a very powerful effect on our minds. Now that we've been home for a few days and gotten some rest I'm back to normal.