I can imagine it would be extremely painful the day after because I had my bellybutton pierced professionally (that took me ages to get my parents to allow me to do it because I was only 14 at the time, it was 3 years ago) and mine was extremely painful the next day anyway so you need to make sure that you don't have anything like pj bottoms too high up while you are asleep because they'll rub on it and just make sure you keep it clean with antiseptic that you would usually use on cuts or injuries, you could use salt water or savlon healing cream too. Just ensure it is kept very clean but don't keep cleaning it, like don't do it loads of times throughout the day because the antiseptic could make your skin irritated, just do it about 3 or 4 times a day. Basically you need to treat it as you would if it was a piercing because it is healing the same even though it is actually closing up. I know I'm not an expert but this would stop any infection or anything from occuring, you may have a small scar but it shouldn't be too bad because you have taken it out so quickly

I hope this helped in some way