Possible poisoning risk?

Check the product bottle, often there is advice about what to do if ingested. If you are worried, I'd call NHS direct on 0845 4647 - there you can explain what happened and your symptoms to someone, who can then advise you on what is best to do. You could also head to a walk in GP centre, which are normally open 7 days a week. You can find your nearest here http://www.nhsdirect.nhs.uk/en/CheckSymptoms/FindYourNearest. I think you should try these services first and avoided heading to A&E as they really only want true emergency cases. Obviously if the symptoms worsen considerably then that's the place to head.