I've been experiencing dyspnea for almost a year now, and kava seems to be the only thing that relieves it (to be fair, I havent sought explicit help for this issue other than getting covid tested to be sure it wasn't that, to which they gave me the full work up, chest xray and whatnot). You're not, by chance, using a low quality kava or mixing it with alcohol/K@ though, right? Those substances can definitely cause dysphoria on the "down". I've never experienced this directly because of kava consumption.