If i had a blood clot on my lung, would i know? i'm 28 and i feel like im breathless today. i've checked my oxygen sat levels and they are 98%. i have anxiety and worry about blood clots. but i don't feel i'm having a panic attack or anything?

No, you won't know if you have small clot in your lung which is usually asymptomatic. With a major clot, you will experience chest pain and shortness of breath with saturation by pulse oximetry less than 90%. Your concern is baseless but it can make you shortness of breath, a symptom of anxiety-panic disorder. Practice deep breathing technique (nasal ins 2 secs, hold 4 secs, exp 8 secs by mouth).