I haven't seen any announcement to say it's been extended. If no announcement then today is the last day and you're not eligible due to the volunteer visa you had.
yes at the embassy or turn up ay the airport and do a visa exemption. The arousing suspicion would only happen if you do that repeatedly over a period of time.
if you get a visa from the Thai Embassy then yes. If you do it often then you may get asked questions at some point if they suspect you're living in Thailand on tourist visas.