Is the email provider, Gmail?
Were you using an email program or accessing the emails through Gmail.com?
First, double check to make sure that you are signed into your account. I know this seems like an obvious thing but sometimes, you will be signed into someone elses account if they used your computer, etc.
The easiest way to check is to open the Gmail inbox and click on image in the upper right hand corner and make sure your email address appears. Does it show your email address?
I am going to provide you with an email recovery form so that you can request retrieval of all of the emails back. After you fill out the form, please change your password ***** someone has access to your account and deleted the emails.
Click here: https://support.google.com/mail/contact/missingemails
If you can take a minute and use the rating system to rate our session as EXCELLENT, GOOD, or OK and press Submit so I am credited with helping you.