@Maria ********
thanks for the reply. Let me tell you what I would do.
I would contact the hospital that you have chosen for your care. They will put together a treatment plan for you.
With regards to the financial requirements I am assuming that your American partner is proving that for you. Normally that will be in a bank account in your name. The Thai consulate appear to be asking for proof of your relationship. As other have said this could be photos, maybe shared rental contracts, downloads from the messaging app you use to communicate.