I Have been getting throat infections regularly in the past year freediving and I think I narrowed it down to a mild form of thorax squeeze with NO bleeding, that nevertheless leaves me open to infections after diving. The infections turn into fully blown flu sometimes and I am out of the water for another month. I get a feeling as if someone is throttling me just after the turnaround when I remove the nose clip and that does it. It's like a sudden vaccuum in my throat. I can stay very relaxed through it. There is no discomfort on the descend. After the dive my throat feels irritated and dry. I am always well hydrated and relaxed, but I have trouble leaving my noseklip on on the way up with air expanding in my nasal cavity. Most divers keep their clip on during ascend. Could this be related?