The striker joined Molde on loan in January until the end of the Norwegian season in November, having scored just twice in 16 appearances for the League One champions.
The 23-year-old told the Express & Star: "To show you actually can play, not just sit on the bench and such, is fantastic for me. Of course you'll doubt yourself when you're not used, absolutely.
"When the manager doesn't like you, no matter what you do or how good you are in training, you get the message 'No, you're not in the squad'. You're not good enough. Then you just want dig yourself under the grass. It becomes hell. So it was fantastic that Molde wanted me and that I got to go back.
"I feel at home in Norway. These are great guys. In England you don't make friends in the team. Here we eat together and socialise in the evenings. In England they maybe will go and have a drink together, but this is different. I feel my career is on the right track again."
Sigudarson last featured for Wolves during their 3-3 draw with Rotherham United in December.