Sorry I deleted my comment about the extra 60 days extension byistake. Youre married to a Thai so you can extend your last 90 days by a further 60 days at your local Immigration office.
You need to extend it in the province of your residential address. That's where you'll do 90 day reports as well, so you won't want to do it in Hua Hin
Not one person here can tell you what an immigration officer will do when you attempt to extend or even enter again in the future. You're talking the piss out of the tourist visa entitlement, so get the correct visa or else you're going to keep getting denied entry and then you'll be up shit creek in a canoe without a paddle
There is an "enter before" date on your visa sticker. You must enter Thailand on or before this date. You will get 90 days upon entry and the clock starts ticking the day of entry.