Take benadryl. From my experience fire ant bites take about 2 weeks before they stop itching.
I just got bit a few weeks ago (15 bites on one foot) and are just now not itching. I still have the bumps though.
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“All his life he tried to be a good person. Many times, however, he failed.
For after all, he was only human. He wasn't a dog.”
― Charles M. Schultz
Warning: The above post may be dripping in sarcasm and full of smartassedness.