My dog is swelling from his neck swollen, testicals and private area are swollen, fluid pockets under his chest, and his right front leg is starting to swell.

I would take him to a veterinary emergency room immediately.
It is possibly an infection, but it's almost impossible for someone who is not a professional to give you a diagnosis
I think it is too great of a risk to let it go untreated

I agree with the above poster, get him to a vet IMMEDIATELY.

It could be a severe allergic reaction... don't wait until his throat swells so much it blocks his airway, act now!