Just jumpng in here...but I think it's totally age appropriate. I think if he's at pre-school then the need to be around you might be more pronounced, but it's normal for 2 year olds who stay home too!
I've found - recently - that if I can just sit and play for a little while - and by that I mean REALLY engage and forget about the things you want to do, ie chores, etc
- my dd will accept when I say, " now mommy needs to get the laundry, cook dinner, ake bed, e-mail, etc.
{{HUGS}} and good luck. I know some days are better than others