You are still in the very initial and early stages on day 2. PAWS is usually weeks or months down the road from what I've read. If you have health specific concerns, you should probalby see your doctor. Having said that just about anything can happen in the first few days. As a reference, i'm about 4.5 months in and still have concentration issues at times.
Be strong and see your doctor if you feel the symptoms are getting worse or you dont' feel right.