I got an error establishing a database connection message. Help!

I am totally new to wordpress, have had my site for five days and have worked day and night to create three blogs and two pages that I have no idea how to link. Either way, now I can’t access any of it, and I have worked so hard I could cry. No access to the database - it refuses me - and I researched hosting sites for so long before picking this one. Can anyone help me?

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