Hello, I need some advice.

I arrived in Thailand on 30 day visa exemption from Australia. I have already extended this once, for a total of 60 days.

I need another 30 days in Thailand as I have dental work coming up in Bangkok around the same time my visa extension will finish on the 15th may.

I’m currently in Chanthaburi and was planning to visit Trat before heading back to Bangkok.

What options do I have?

-Can I go to Trat Immigration and get an extension?

-Can I travel to Cambodia by land for say 1 weeks and then come back to Thailand on another 30 day exemption?

- or will I have to fly into Cambodia ?