I went through a similar situation not long ago get help 1-888-303-0822, and while it was annoying, I was able to regain access to my account. Here's a step-by-step tutorial to help you accomplish the same.
1. Start with Google's Account Recovery Page.
First things first, navigate to Google's account recovery website. You will be prompted to enter the last password you remembered. If you can't recall it, don't worry! You have additional options for verifying your identity.