Isn't that the "tonic" in "Gin & Tonic" ?
G&Ts almost certainly won't have any effect on your susceptibility to infection nor your prognosis once infected. But they might help with (or make worse?) the anxiety associated with the panic.
And 6L of tonic water is... quite a lot.
Shudder.
The ibuprofen did its job though.
(I do not recommend this and am not a doctor)