Oh dear! I feel for you! I got attacked by a colony about 3 years ago while digging in the garden and it took my wrists and arms, where I got bit, about 4 weeks to heal up.
Time to bring in the ‘Heavy armor’ and buy fire ant killer at Lowe’s or Home Depot. Read directions carefully, I think after you put the granules on the nest you need to lightly wet the granules.
Do yourself a favor and spread the ant killer all around the surrounding area so the fire 🔥 ants don’t leave the current nest and build another one 5 feet away. Happened to me and so I did a 10 x 20 foot area and watered in; finally got rid of them. You can borrow my bazooka AND I’ll send over a bottle of Jack Daniels for you to kill any pain from the inside out!