For me, the process of flying is full of over-stimulation. A tightly packed airplane. Noise, stale air, vibration, uncomfortable seats and more are a strain. Airports are full of stimulation and stress. The poor sleep surrounding the travel. Disrupted diet.

It is just stress filled. Add some illness and recovery from the trip will be troublesome.

Try to take it slow and get healthy from the bug. Time will help you return to normal.

My best to you.

btw. My wife would rather drive the 11 hours to our normal destination than take the 1.5 hour flight because of how I respond to the stress of airports and airplanes.