Fish caught in net

Hi,

We recently put a net over the pond to catch the falling
leaves.Unfortunately the net slipped into the water and was laying on the
water surface in places.One of my little goldfishes somehow got caught in
the net yesterday during the night.
We discovered him in the morning half out of the water-not sure how long he
was like that.
After un hooking him we thought he had already died but after a few moments
swam away.
At feeding today he is very doppy and seems to have damaged himself all down
one side (presume by wriggling to free himself) He seems to stay at the
bottom or sit in the shallows. I really dont think hes gonna last much
longer
Problem is we are off on holiday tomorow night. Our neighbour is going to
feed them for us but im worried if he dies when were away and they leave him
there.. will he distrupt the water quality and harm the others?
Should i take him out before I go away?

Thanks for any advice.