e-mails disappeared

 if I remembered correctly, my account is intact and nothing is missing 2 days ago. but last night I found out that all e-mails in my "important" folder disappeared. its very important to me. and I found it in "deleted" folder which I didn't delete. even accidentally! so I quickly moved it back to important folder just now. so how can it be moved to the deleted folder when I didn't delete any of it. another one is my "draft" folder which is the most important! my draft folder still exist but its completely empty! its not even in the "deleted" folder. I use it as a storage instead of my phone, laptop, or skydrive because I can access it anywhere. and for that same reason I didn't backed it up or used other storages cause I relied on it too much. I've been relying on it for more or less half a decade and some of the content in my draft messages have been there for that long as well. and this is the first time it happened. you dont know how important those are to me personally so please don't tell me you can't recover it.