I have mild allergic asthma (mainly triggered by indoor dust or mold) which like you usually is worse on the back end of a cold. I’ve started doing 7 day fasts and it’s bananas how my cough will completely go away by day 2. I can tell it really brings down inflammation for me so I’m a big fan of fasting.
I have severe ACOS (asthma COPD overlap syndrome), caused by a pulmonary embolism. Usually 3 major attacks a day. Extended fasting, IF and strict keto have resulted in only 1 mild attack. My O2 levels are also back to normal. It’s been 2 years since the PE but it wasn’t until I started extended fasting and keto that my O2 levels stabilized. I’m doing a weekly 72 hr fast followed by 16:8.