Let me suggest you that you should apply in person any convenient consulate. That might not be lost visa fees. Once they accept and give receipt. You have good chance to obtain visa.
I have an appointment slip on 1st week of November and visa invitation letter from Hospital and all my medical records from my own country has been submitted as I am suffering from type 2 diabetes. My wife and I applied together but she doesn't have separate account. I made a sponsorship letter for her.
I applied it as soft power medical treatment and my wife is included as dependent. We have applied Thai Consulate General, Penang. Submitted on Friday and received on Tuesday.