I just checked and it is available in the UK. Ask your pharmacist or chemist.

It contains bismuth subsalicyclate. It is usually sold as a pink liquid which is swallowed when one is nauseated. It is strong enough at suppressing the vomiting center in the brain that it can actually counteract a small dose of syrup of ipecac emetic. It is usually also available in tablet form, but I don't know if that is true in the UK.

It is not an anti-anxiety med, but it always makes me calmer just knowing I have it.