@Larisa ***
Yep I've got that paper too (I made them gimme all the different ones a while back).
There is NO 1 year, Non-Immigrant Visa that you can get inside the country :/
What you actually would be doing is applying for a 90 day Non-O based on having a spouse which legally works here for 2000baht.
The application would go under consideration for 14 days (which is why you need 15 days left on your current stamp). Then you go back and get the 90 day Non-O visa stamped in, along with a used stamp on it and you'd also get a new 90 day "admitted until stamp".
After that, when you have 45 days or less left on that stamp you just got, you'd apply for a yearly extension of stay based on being the spouse of someone who works here for 1900baht