I lost my email and had to make a new one but lost all my important information in the old email and contacts?

You made me get a new email address and I lost the old one with all my important emails and contact data from the old one Millcreekman2001 and I need them back as I am a appraiser and its very important - how do I get them back

I lost my email and had to make a new one but lost all my important information in the old email and contacts?
Unless you could log back into your old account then everything is gone