my fish in my 27 gallon freshwater tank have had ick off and on for several weeks...

[Laura]

...now..it won't go away? my fish in my 27 gallon freshwater tank have had ick on and off for several weeks now..i have put the medicine in..taken the carbon out..raised the temp..done partial water changes and it goes away for a couple days and will come right back. i'm getting very frustrated and don't want any more of my fish to die..it's getting way too expensive..does anyone have anymore suggestions?!?! please help