أحسن الله إليك I've been getting doubts during Salah about passing wind. Sometimes I can't tell if wind actually passed or if I'm imagining it. Other times I feel wind coming on, hold it in, then doubt whether I actually held it back or not. Is this waswas? Should I ignore it?

This is waswas, so ignore it and never leave your salah for it, because the Prophet ﷺ said he does not leave until he hears a sound or finds a smell (agreed upon). Certainty is not removed by doubt, so your wudu stands until you are sure something came out, and being more inclined to think so is not enough.