I didn't notice this post first time around. My concerns are with the physical symptoms: apparent decline of certain skills such as handwriting/drawing and seeming inattention, etc. I really don't want to freak you out with internet diagnoses even though I have personal familiarity with several possibilities, including an extremely rare cause. Keep in mind that the most likely reason should be relatively minor. Suffice it to say that the first medical opinion I would seek in your case would be with a pediatric neurologist. I hope all goes well with your DS.