Okay, I'm looking at what I can for stuff like that, and at least from the stuff I can find on things like your situation, there are a few bits of note. Again, don't take anything I say as law and do not make any decisions based solely on my input, it is imperative that you consult with professionals who have a legal interest to be well informed, up to date and working in your interest, just, I can give a perspective look at least.
It's worth noting that in a lot of cases, sales on eBay won't count as income that should be reportable to the IRS. Specifically, anything that you bought for your own use, then sold at a lower price than what you initially bought it for, doesn't/shouldn't count as income. You can't claim a loss on it or anything, but you shouldn't need to report it as income. If you were reselling, that's probably absolutely income, but selling used goods may not be classified as such; check with a tax consultant on that.
For the paypal stuff, you should also check and see if you can't just roll it under "income taxes" in general. A lot of the time, you can classify it all as income and have it bundled into the same tax rate and tax bracket, so it wouldn't have too much of an outsized impact on your finances. Jumping that much higher seems surprising to me, but if it's being classified under a different status that could explain it somewhat.
Again, I must stress, look for a tax consultant who can look over your records intimately and personally, that will be of far more value than some jackass you talked with on the anime girl streamer board. But there should be some useful stuff you can do.