Don't worry, a lot of people end up with multiple accounts for one reason or the other and they are not going to confiscate your points or anything like that. Just email them and said you want to merge the 2 accounts and they will 'gladly' do it for you. But one thing, you won't be able to see the reservations of the account being merged once you merged the 2 accounts (you still have the reservations, you just won't be able to see them anymore). You lifetime stays will merged also.