The following list covers some of the more common causes of stomach and intestinal symptoms and problems. You can read about each disorder to see if its symptoms sound like what you are experiencing. If it does, you can read on to see what you may be facing in terms of diagnostic testing and treatment.
Goliath was either 6 cubits and a span (a little less than 3 meters or 9'6) or 4 cubits and a span (2.1 meters or 6'9). When calculating weight (for muscular or stocky people) you take their height in feet and cube it, which would put Goliath's weight at around either 860 lbs (taller height) or 310 lbs (shorter height).
The largest confirmed weight of an adult insect is 71 g (2.5 oz) for a giant weta, Deinacrida heteracantha, although it is likely one of the elephant beetles, Megasoma elephas and Megasoma actaeon, or goliath beetles, both of which can commonly exceed 50 g (1.8 oz) and 10 cm (3.9 in), can reach a higher weight.