What's the process to repair a hole in my Maxillary sinus bone and what's an idea of what it will cost?

Do they have to do some kind of skin graft? While extracting some upper teeth my dental surgeon made a large hole there. Now sinus infection is constantly leaking straight into my mouth. I don't have insurance.
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The gum tissue is usually pulled over the hole opening into the sinus 9 the oral-antral fistula) and you will be given antibiotics and special instructions to follow. This is considered oral surgery and if you have medical insurance, it will be covered. Ask the oral surgeon agout costs and possible insurance coverage. Good luck.
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