Puppy Teething

How can I help my puppy through the teething?
I have a jack russel from 5 months and seems to be really suffering from teething, that has completely disappeared from their food, and occasionally I'll just mourn him. He was sick a couple of days ago and it just seems so sad! I do not know if this is normal? I've been giving him rawhide and keeps him busy and seems to help, is there anything else I can do? In addition, when teeth are coming through for, its upper milk teeth have not come out yet, but the second set coming through, so it has two sets of teeth of the upper? Are they going to fall soon?
Ice cubes. Eric added ice cubes. Http: / / www3.snapfish.co.uk/slideshow/AlbumID = 2336713011/PictureID = 88,141,129,011 / a = 1922506011_1922506011 / well, get a rope toy, put it in the freezer. Cold relieves pain in his gums. All teeth will come out over time. Especially if you play games or tug of war Bloo OT and flies everywhere. I was scared, but t was normal. Knot rope toys were better though. At least not as the rope. (most times)
Puppy Training & Care : What to Do With a Teething Peekapoo Puppy