Thank you for your thoughts

His breeder is devistated & is doing all she can but is just as baffled.
He hasnt seen a specialist yet as the vet wanted to get his breathing better before putting him through anymore strees. He is convinced there is an underlying cause as his heart & lung ultrasound looked fine & the xray of his heart was fine it just showed the fluid on his lungs which they drained but didnt test

& no idea why a perfectly healthy kitten should suddenly have this problem.
We live at the end of the world well not quite but you can see it from here

so realy hopeing we dont have to take him on a long car journey. The vet has always been very good at diagnosing our other pet probs he is just baffled hopefully we will get some better ideas & news tomorrow.