My 7 yo DS has developed an irrational fear about needing the toilet for a wee. He is absolutely fine when at home and behaves normally but when we are out he believes he needs the toilet so we must find one or do a wild wee. He can do this up to every 20 minutes. He has a sense of panic and keeps repeating that he needs to go. Can anyone help? How can I reassure him that he will be ok if he doesn't go so often?