Milk shake for gastrointestinal pain?

Not really. Milk helping stomach pain, ulcers, gastritis--it's a lot of bologna-:). Iced could make it worse. Perhaps if your stomach is programmed since very young to get relief from it, then in your case, it may reduce pain. The brain and gut are closely connected. The 'solar plexus' is complex of nerves in mid-gut; it is possible that the stomach nerve supply may be evolutionarily the original brain!