sorry to hear of your woes. please ignore and disregard the obtuse and soulless lecturing you've received from keyboard warriors.
suggest you move out of phuket, perhaps to Isaan for a while, to limit costs asap. That'll give you some time to prepare yourself.
You could then get a little cash together for a volunteer visa, to stay in the kingdom while having something to do, to maintain momentum and keep spirits high
Then look for teaching work through which you can weather the storm
So (new to this) - with a new "valid" stamp alongside my valid METV VISA - I can get married, and stay in Thailand as a married person, without needing to head back to the UK?
The ask:thailand community, consisting of multiple Q/A groups with over 100,000 members, powers this platform. It is not an official government resource. Our members actively contribute to this resource, and while we strive for accuracy, we cannot guarantee its complete reliability. Assistance to travelers is provided as a community service.