Please post an introduction in the Introductions thread so you can get approved to post elsewhere. Once you get approved, post in the Nutrition/Health section and we'll see how we can help you out. There's a lot of knowledgeable people here.
Regarding your pup, since you got him at such a young age I would definitely take him into the vet. Better safe than sorry. Pups that young are vulnerable.
But please post an intro so we can all get to know you!