Gastric problems are..

Hiccup.
IGNATIA, MERCURIUS, NUX VOMICA, CYCLAMEN.

bAD BREATH.
CARBO VEG, NUX VOMICA, PULSATILLA, SILICEA, SULPHUR.

bAD MOUTH TASTE.
BRYONIA, CALC CARB, MERCURIUS, NUX VOMICA, PHOSPHORIC ACIDUM, SULPHUR, ARSENICUM, SILICEA, BELLADONA, ARNICA, CHAMOMILLA, MERCURIUS, PULSATILLA, CATHARIS, HEP SULPHUR, BRYONIA, LYCOPODIUM, NUX VOMICA.

Gastric damage.
Pulsatilla, bryonia, lachesis, lycopodium, nux vomica, sulphur, arsenicum carbo veg, china, mercurius, pulsatilla, sepia, chamomilla, china, staphysagria, arnica, bryonia, rhus tox or sulphur, veratrum, calc carb, ipecap.

ARNICA, ARSENICA, BRYONIA, CALC CARB, CARBO VEG, CHAMOMILLA, CHINA, COCULLUS, GELSEMIUM, HEP SULPH, IPECAP, LACHESIS, LYCOPODIUM, MERCURIUS, NUX VOMICA, PHOSPHORUS, PULSATILLA, RHUS TOX, SEPIA, SILICEA, SULPHUR, ANTIMONIUM CRUDUM, PHOSPHORIC ACID. 

Diarrhea.
ACONITUM,APIS, ARSENICUM, BELLADOINNA, BRYONIA, CALC CARB, CARBO VEG, CHAMOMILLA, CHINA, CINA, COLOCYNTHIS, FERRUM, GELSEMIUM, HEP SULPH, IPECAP, MERCURIUS, PHOSPHORUS, PODOPHYLLUM.
pULSATILLA, SULPHUR, VERATRUM ALBUM, ANTIMONIUM CRUDUM, HYOSCYAMUS, PHOSPHORIC ACIDUM, SECALE.

Hard stool.
APIS, BELLADONNA, BRYONIA, CALC CARB, CARBO VEG, CAUSTICUM, GRAPHITES, IGNATIA, LACHESIS, LYCOPODIUM, NUX VOMICA, PHOSPHORUS, PULSATILLA, SEPIA, SILICEA, SULPHUR, VERATRUM, NITRIC ACID, OPIUM.

Heartburn.
CARBO VEG, CHINA, NUX VOMICA, PHOSPHORUS, PULSATILLA, SEPIA,

Colic.
ACONITUM, ARNICA, BELLADONNA, BRYONIA, CARBO VEG, CHAMOMILLA, CHINA, COCCULUS, COFFEA, COLOCYNTHIS, IPECAP, LYCOPODIUM, MAGNESIUM PHOS, MERCURIUS, NUX VOMICA, PODOPHYLLUM, PULSATILLA, SEPIA, VALERIANA, VERATRUM, HYOSCYAMUS, PLATINA.

Hemorrhoid.
 ACONITUM, APIS, ARSENICUM, BELLADONNA, CALC CARB, CARBO VEG, CAUSTICUM, GRAPHITES, IGNATIA, NUX VOMICA, PULSATILLA, RHUS TOX, SEPIA, SULPHUR.