Best thing to do is to just persevere with the cloudkill tactic to get rid of the umber hulks and hopefully some of the flayers. If there's a door try and slam the door shut when you cloudkill the room so they don't go chasing after you. If you can repeat this over and over you can kill them (kinda cheesy but if you're desperate...)
Then use some summoned fodder as a buffer to prevent the flayers from engaging you in melee and try and pick them off with ranged weapons. If you have to close with them, make sure your guys are buffed up with haste etc because you need to kill them quickly - usually you will die in between three to four hits because they drain 4 pts of intelligence each time they hit.
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