That is always worth checking out, especially if you have missed a period. But in pregnancy you wouldn't normally get bad smelling wind.
Is it possible you could be pregnant? Ive had the same taste in my mouth and stomach problems too.
Sounds like you may have some sort of tummy or bowel bug or an irritation to the lining of the bowel by a bug or from something you have eaten.
Just eat bland foods for the time being, nothing fried or strongly flavoured. Drink plenty of diluted juices and water and plain soup. Eat small quantities at any one time. Avoid dairy produce until you start to feel well.
Your stomach is trying to get rid of an irritant and this could be a particular food that you have eaten or any type of bacteria.