just had a mini heart attack.. put my 2 year old in his crib for his nap, he can get out but I've…

just had a mini heart attack.. put my 2 year old in his crib for his nap, he can get out but I've lost the instructions to convert it.... I came downstairs to switch laundry and I heard him upstairs... I get up there and he's in my room and has managed to open the tums and put 2 in his mouth... I got him to spit them out, 1 full one and about half the other... I called my husband frantic and he said that our son should be ok.... ugh this kid is trying me today