My grandparents were Scandinavian - and Grandma B would occasionally use these words - not sure about the exact spelling - with what I think they may have meant
Uffda - so sorry you smashed your finger
Phida - stepped in doggie doo or the cat threw up on the carpet
Ishta - stepped in doggie doo or the cat threw up on the carpet
They seemed more or less interchangeable to me. I'm sure there are nuances between them, but I don't know what they are.