Thank you for your question. To answer your question, Is any one here? I usually check my computer once a day or so. So you can expect a reply within a 24 hour period.
Secondly, any urgent questions or emergencies
should be handled by your own personal dentist.
Now to answer your main question. Since none of your doctors were overly concerned about the yellow coating on it, that tells me it is quite normal. By the way, smokers tend to have more of a coating, and a darker color at that!
Anyways, I'm sure the burning you are experiencing is from overzealous scraping. The spicy food probably didn't help either.
Nothing to be worried about. Try minimizing the scraping and then every day do just a bit more. Your soft tongue has to get used to the scraping. It didn't all build up in one day so don't worry about not getting it all off in one day!
I have had patients with the exact same condition: a coating or a film on their tongue, excessive scraping, and burning and/or bleeding!
Take it easy! You will be fine!