Well I see none of the experienced members have spoken up yet (they probably will, don't worry).. I'm inexperienced except from years ago so listen more to them once they show up.
They might want to know whether you have another tank (long shot!) to move fish to.
Do you keep the large containers with water for your next week's water exchange in a cabinet somewhere? That's what I used to do for a goldfish a while back. If you have that water, which would have lost its chlorine after some days and which would at least be up to house temperature it will give you a nice start on a partial exchange.
Your ammonia, nitrites and nitrates have probably spiked up and I'll bet they are going to tell you to do a water exchange of some amount (I can't imagine 20 percent would hurt, but remember I'm inexperienced and this might just not be enough in your emergency situation.. but I think it would be safe if no one else answers you soon.)
It may be that they will suggest you try to get fish to a fish store or a friend so you might think whether that will be a possibility.
OK, very sorry for your situation and good luck. -waterdrop-