My Son is 4 months old and rolls over but hates being on his stomach, how do i prevent him from rolling safely?

Every time he rolls on his stomach he wakes up screaming and then i have to get up and move him back on his back, this lasts about 10 mins before he rolls back over again. im loosing sleep, he is loosing sleep and we are all gong nuts. someone help! i know that back positioning pillows aren't good to have and especially aren't good to have if they are rolling, but im just wondering if someone out there has gone through this and can give me a little advice. ive tried swaddling him and that helped for a week and now he is back to rolling, i hope someone can help!!!