Oh yes... some beardies can stay stressed when they first come to their new home for up to 3 weeks ive heard so i wouldnt worry about 3 days Just let him get adjusted for a week or so then start trying to handle him if you think hes getting to stressed out.. Im sure you will notice a difference in after having him for a week.. I sure did with my litle Falkor.. He still doesnt like the giant hand but once i have him in my hand hes a little sweeheart and isnt too skiddish..
How old is he?
It really depends on their age how much they eat..
When i first got my guy he wouldnt eat any more than 5 or 6 a day then about 4 days later(about a week after i first got him) he started chowing down like 40-50 little 1/4" crickets a day.. Make sure that the crickets are no bigger than the space between his eyes.. I know my little guy seen a full grown cricket and took off running like the cricket was some kind of monster haha.
As long as you have all your lights and temps right i wouldnt worry too much.