Has anyone experienced sudden and rapid onset of dropping Spirometry numbers and rapidly rising heart rate? In my case 94 to 68% Spirometry and heart rate 94 to 138. This has happened on several occasions. Sitting on sofa all is fine then get up and walk 8 feet to my kitchen and BAM! Out of nowhere. This lasted around 30 minutes. Extreme SOB including loss of bladder function. (Uncontrollable urine release) Horrible experience trying to regain breathing.