My pied girl was a garbage disposal for a long time and recently (last shed) she refused to eat from the time her belly went pink till she completely shed. She did the same thing belly wnet pink last week and didnt eat. She id now deep in shed and just cleared her eyes I fed everyone else last night she didnt even come out of her hide to smell. As for poping noises I hear them everytime any of my snakes go itno shed so I would not worry about anthing until your has completed shed then he should be very hungry so feed away. After my last $70 for a great check up I would not take my snake in for just noises look for mucus in the mouth or a second indicator of RI. As was stated RI scares everyone and I think we tend to jump to it must be RI for every little noise.