Outlook PST

Hi All

I have a nightmare and hope some one can make a suggestion. I had outlook as a profile, I created a second profile with my new email provider. I attached the old PST into the new profile and started to drag and drop from the old PST within outlook to the new inbox. Soothing when wrong, I see the folders in the new inbox but no email.  I cant see anything in the old attached PST and don't know what do do any ideas how I can recover from the. I didn't back up outlook, I don't have a backup of the laptop! I think I am about to learn the hard way.