My problem was too high of temps for my potted peppers, causing them to mildly wilt. No discoloration or leaf drop like your situation seems to be. From what I know fusarium wilt is caused by soil that has it, so you are pretty much screwed. Some plants recover from it on their own if they show signs of it when more matured. Ride it out, and fix the soil problem is all I can say. I have a family friend who owns a plant business and they ended up answering my "concern" for some of my potted peppers getting droopy after being in the sun. Good luck, wish I could be of more help.