Motion sickness - could be in a car, on a bus or train, in an aeroplane or boat.

If you are badly affected by motion, feeling weak and hollow and empty. Better only when the motion stops you might benefit from using Cocculus indicus.

Vomiting and diarrhoea

You are very chilly, restless and anxious. You have profuse vomting and diarrhoea and are begining to think you might die of it! You probably would benefit from some Arsenicum album.

You have been through the above stage, but can't seem to recover properly with symptoms returning every other day - China officianalis

Constipation away from home

It always happens - regular as clockwork at home, but the minute you leave your front door, your system goes on strike, not to recover its equilibrium until the front door is safely shut behind you again. You might even get into a state before you even leave the house for a holiday / visit - Lycopodium 30c once daily, starting before you begin your journey has helped many people like you.

Help with buying and taking remedies

Obviously if any of these symptoms persist, a visit to the GP is your best bet.