3 days isnt enough time. i have fought ick before and i always turn the heat up like you did, and add aquarium salt.. wait a week. ick is a single celled protazoan critter-by turning up the temp you are accelerating the life cycle of the ick-when you see the white spots on your fish, that is the ick feeding off your fish. they will eventually drop off and become free floating in the water column.
In a few hours after that, they form a cyst and drop down into your gravel or sand. these multiply, and have to find a host (your fish) within 24 hours or they die off.
ick is present in almost every tank-and is opportunistic and takes over on sick fish, or lack of good water (not doing waterchanges) poor diet, or just weak, sick or stressed fish.
i would keep the temp up, wait a few days and look for improvement (make sure you have aquarium salt in there), and once you see the fish looking better you need to do a good waterchange and syphon your gravel REALLY well. take all rocks or ornaments out and i would soak them in a bucket with a tiny amount of bleach and scrub them good.. keep rinsing til you cant smell any bleach at all!
syphon your gravel really well about every week for a while..
