just updated to new gmail account now can't access my email from the previous account

Jul 12, 2018
When I went to login to my gmail account I was forced to update the gmail account and now I can't access my previous account.

Is there a way to go back to my previous account and use my previous email address?

I did try to enter my current email address but the message said that email address was all ready in use.

Need my previous account

Thanks Neola