Change your email password, and account password. Make sure that any accounts that you use the email and password for you change too. Contact theymos through personal message to see if he can find anyone matching that VPN. Although, it's likely a VPN/Tor exit node and won't be helpful.
I don't think theymos would have the time to respond. There are accounts on this forum that still need to be recovered for people who have proven that they own the accounts (Trankil is as example). This would be very low priority and you probably won't hear back for theymos.
Agreed, change your email and password like Welsh said.