I am not receiving emails on my eM acct since I changed my Google Email password.
Have you re-entered changed password in eM Client or seen any password prompts?
It works with saved configuration and if you changed password for Gmail mailbox eM Client will still use the old one.
How do I update to my new password?
When eM Client syncs with the server, you will get a pop-up window like this:
Enter the new password, and make sure that Save password is selected.