Before you think he is sick... If you do not see mucus or bubbles in his mouth he might just have a piece of stuck shed in his nostrils especially if you hear the "clicking noise" coming from his nose. Also from personal experience if your animal is still on the small size "under 600 grams" it could be stress driven his "wheeze". Some little ones will let out clicking noises under serious stress. Doesn't necessarily mean they are sick. I would leave him be. If you want to increase temps to attempt to help burn it out no more than 2 degrees. If he is still feeding that is a good sign this is stress induced. I would leave him alone for the next few weeks. Let him relax, feed, and shed. See if it was stress induced.