Yes, SWOONED is a Scrabble word!

Letter values in Scrabble US: S 1, W 4, O 1, O 1, N 1, E 1, D 2.

Is it a valid word?

SWOONED is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

pass out from weakness, physical or emotional distress due to a loss of blood supply to the brain

Also: pass out.