A few days ago during a short flight I had some unusual breathing experiences as the plane started to descend:

• 1 hour of pressing on chest and labored breathing as though breathing reflex went from semi-automatic to manual mode

• Just before landing extreme dizziness and some blacking out feelings for a few seconds at a time

• Sudden shivering from cold when it wasn't cold towards the end

• Got off plane was difficult to put one foot in front of other at first

• Sat in connecting airport a little disorientated for quite a few hours

• On the next flight I took Mestinon and had no problems

This is the third time this has happened but the first times were vague enough for me to dismiss them.

Surely that can't be anything to do with oxygen depletion as 24 hours later I had a brain scan for research and the abundance of firing and wiring and proton activity means that clearly I have quite enough oxygen circulating around my brain! And I did do quite a lot during my trip without too many issues.....I am flying home tomorrow and hope things will go OK...

Anyone had any issues with flying before?