Ah the struggles of the poison we have to endure as Americans isn’t it? That sucks! One of the things I could recommend, if you have the ability to find one, is a local farm that makes their own olive oil nearby. There’s a bunch of places in maine and New Hampshire for example that grow olives and press their own, creating true olive oil and they sell it in bottles that you can refill. I don’t know if it’s completely free or corn but it’s what we do for olive oil even though it’s a little pricier.
It sounds like the source of the allergies are quite a few gut issues, which I’m sure you’re well aware of. I wonder if parasitic cleanses would help you, to alleviate the stresses in your gut and allow your body to start to heal. We’ve been doing a lot of research ourselves in that and it’s pretty wild what those bastards do to our bodies!
Food for thought :D