Hi Gail, so sorry to hear of the evil switcheroo that has been pulled on you with the unexpected O2 fails. I realize you've participated here in the past and you know about the two most popular non pharmaceutical approaches: D3 regimen and busting, so I'm at a bit of a loss for any good new ideas. I suppose you've tried caffeine or energy shots with the O2 to give the abort that much better of a chance. Then you mentioned the seasonal change, and you're probably aware that an antihistamine such as benadryl or quercetin is known to be recommended as an adjunct to the D3.
There has been a mini trend that finds some respected CH'ers using DMT for aborts with 100% success rate, but it seems to be hard to source, and not exactly all that simple to extract either (plus it is one of those illegal psychedelics, although an extremely short lived, short trip one).
I don't have a recollection of whether those PH affecting grapes and oranges have ever been discussed as having any effect on CH prone-ness. Personally I'd be skeptical that they'd be the culprits, but maybe we'll see if anyone is interested in discussing that.