lots of people fell like this when they get a new pet. Especially something sort of strange and different. You can also get those anxiety knots from excitement. Fear, love, anticipation all have the same physiological reaction so just take a deep breath and try to do something calming. You're definitely not alone in the worried hedgehog parent department. Read all the stickies in all the sections on this site and do your best. I'm sure everything will be fine.