Welcome to Justanswer.com, my name is Dustin.I'm sorry to hear about the issue you are having, I will do my best to help you resolve it.
Gmail can be a bit strict with their password ***** protocol.. let me ask you this.
Do you have any computers or phones that are still signed into your gmail account?
Also, did you ever sign into your gmail account from a computer?
And also, is it important to get back the same exact gmail account ( if you havent used it in two years, could we not just make you a new account if theres nothing important in the old account?)
Thank you for reading and replying in full to my questions, I look forward to assisting you.