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I do get this at times. I can sometimes make that feeling go away with stong coffee, 5 hr energy drink, any type of energy drink like monster or redbull. I have also has success with strong ginger tea for days like that.

If by "O2 machine" you mean a concentrator that makes O2 from room air, the answer is generally no, it won't work as well, for two reasons: (1) there is a some room air in what it creates, so you are not getting O2 that is as "pure" as what you get from a tank, and that seems to affect the speed of aborts, and (2) I suppose there must be concentrators that go up to 25lpm, but most of them don't, so you probably wouldn't get a best-quality abort.

Hey bb1283, I purchased a demand valve last year after the CB Conf., on the recommendation of another clusterhead. It works really well, and saves a lot of O2. https://www.diversalertnetwork.org/dive-store/?id=39 . I paid $205 last year, last week it was $192. Description: DAN Demand Valve w/6-foot hose sku is 611-3000. Good Luck