Im no expert but those symptoms sound like classic detox symptoms. Its likely that the extra oxygen will have probably killed off some viruses/bacteria and / or parasites giving you those symptoms.
If it was me I would start out slow with the ozonated water and increase gradually and also drink a lot of filtered / bottled (non ozonated) water to help flush out toxins and also ensure you are having at least 2-3 bowel movements per day.
Can i ask what machine you are using as Im looking to buy one.