Really Upset. All work emails, folders are GONE!!

Hi please help! I am using GoDaddy and LCN which are pop accounts. Last week I started to receive message of hard disk full and I remembered  I received a notification message from my Outlook as well. I don't really remember what was it exactly but I just ignore it instead because I am worry if I change anything I will lose all my folders and data I created in my Outlook (I am using Outlook 2011). I was holding four/five accounts from my work emails (all GoDaddy emails, e.g info@....). I have created a lot of folders to get them organised. I am very organised person but when it comes to this kind of problem, I am not prepared! Especially for the hidden files not seen, as I am still new with Mac.

Please I need to retrieve back all the emails, I have been organising it for the whole year. My life pretty much depending on it now as I have business overseas to run, contacts and important information in the emails. Now my Outlook is totally empty. The folders are still there but no emails. Please anyone tell me if there is a way I can retrieve back all these emails? It seems something to do with the setting.

Should I reconfigure my Godaddy emails back to outlook?

Please kindly guide me step by step process to solve this, what should I do to undo and retrieve everything back again like before?

I look forward to hear from you.