One day i couldnt log in my account. I changed my password and it let me in. But now all things i had just vanished. I had Modern Warfare and Cold War.
Please contact the Support Team about this, it could be that you have logged in to a different account than the one you previously used.
Make sure to include any E-mails you may have used on the other account and any BattleTag you may have used.
If you have Blizzard Order IDs or CD keys for the games on the account then include those also to make it easier for the Support Team to locate the account.
All the best!