Can you assist with getting a one year special visa in Thailand?

Given your husband's ongoing medical treatment in Thailand, the Destination Thailand Visa (DTV) could be a suitable option for long-term stay, as it allows for up to 5 years with annual renewals.
Your husband may apply under the DTV (Softpower Category), provided you can demonstrate his need for ongoing medical care in Thailand. As his spouse, you may also apply as a DTV dependent, allowing you to stay in Thailand for the same duration.
DTV Application Process & Requirements
For the DTV, your husband will need to provide:
- A medical certificate from a recognized Thai hospital confirming the need for ongoing treatment.
- Proof of financial stability (500,000 THB per applicant in savings or equivalent in foreign currency).
- A valid passport with at least 6 months validity.
For the DTV Dependent Visa, you will need:
- A marriage certificate as proof of relationship.
- Financial documents to show sufficient funds for your stay.
Important: The Application Must Be Submitted Outside Thailand
The DTV application must be submitted at a Thai embassy or consulate outside of Thailand, and you will need to remain outside the country while awaiting approval. Processing typically takes 1–4 weeks, depending on the embassy handling the application.
Let us know how you'd like to proceed, and we’ll be happy to assist.

There are many options available to you. The other firm mentioned the new DTV, and there are other options available, such as changing your visa to a retirement visa, LTR visa, or extending your current visas through an extension of stay. These options will be easier and more economical.