Oh you are sooo not alone! And let me share what I have learned. My son is now 7 yrs and still wets the bed. He never has had a dry night since he was born. Anout a year ago he suddenly had to pee at inappropriate times and frequently, like standing in line for something, then he'd have to go about 6 - 8 times with barely anything coming out! I was certain he had an infection. We ended up at a urologist and he was fine. They suggested hormone therapy - it did not work, we tried another brand and it it did not work. I began to read and discovered that:
A) if you have a bed wetter in your family history odd are good you will have one (we have two - poor kid!)
B) as boys grow so do their bladders, making them wetter some day, plus hormones in their bodies can take time to develope
C) most boys will out grow this somewhere between the ages of 7 - 10 years of age
D) it can also be caused/or incouraged by a food allergy. I have heard milk and food coloring and be triggers, but you may want to check his diet.
My son will camp out, go to sleep overs, etc. I bet if you talk to most of the moms your son is not alone. My son realizes that his body is just taking its' tiome growing and eventually his bladder will catch up. He is tired of wearing good nights, but knows there is nothing 'wrong' with him, he is just growing.
Bottom line is, yes, go to the pediatrician. They will give you lots of insight, and try stuff out. The medicine they give you is an antidepressant which one of its' side affects is bladder control. The main cause for yours sons bedwetting is just hormones that have not gotten going! Plus change in bladder size - sometimes too large for the small body and sometimes too small. This hormone resides in his kidneys, sometimes meds can jump start them, but in others it cannot and I am not certain it is worth the risk. The choices are out there, but maybe it will ease your sons mind if he finds out that some of his friends don't stay dry either!