Hypoglycemia and assorted disorders
The only time a dog will display diarrhea as a result of stress is if the stress has resulted in illness.
There is no such thing as a worm that wraps itself around the intestine. Worms live inside the intestine, and some such as the round worm have as part of their life cycle the release of microfillaie into the blood stream. Other worms such as the hookworm attach to the intestinal wall. Since you are keeping your puppy up to date on its worming, and keeping it inside, the chances of problems due to worms or other parasites drops dramatically.
I did a brief search on your posts and couldn't find any prior on your dog's illnesses, so the background is quite unclear and how it was arrived at that the puppy was hypoglycemic(?).
The diarrhea you describe is typical as originating in the upper small intestine, and is indicative of digestive problems. Most likely it's directly related to giving the puppy syrup or sucrose based sugar. It's not unreasonable for large amounts of sugar ingested to cause flatulence, digestive upsets, including diarrhea in a puppy. This in turn as another poster suggested could cause imbalances in the bacteria flora in the intestine.
In general a hypoglycemic puppy should not be given sugar routinely unless the begining of a seizure is detected. What you can quickly get into is a situation where you give sugar, the puppy over produces insulin, creating a rebound effect or another sudden drop in the blood sugar. Probably there are other puppy foods out there other than Purina puppy chow that would be better. It is important that the puppy is given free choice per the food, so that it can feed several times a day, rather than a couple of large meals. In fact most puppies should be fed free choice unless they are the fast growing large breeds.
Your Vet will probably give you some Metronidazole and possibly prescribe some lomotil to calm down the intestinal movements. If the saliva of the puppy becomes stringy or vicous, then it's dehydrated, and you should seek immediate medical attention. You should ask your Vet about a diet that will control the blood sugar- without sugar/syrup being given. A puppy may or may not grow out of hypoglycemia depending on the underlying condition.