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Firstly there could be a chance you had some diary product by mistake.Secondly all these symptoms suit with with Gastroesophageal reflux.You could be having dyspepsia
.I advise you to take timed food avoiding spicy items.take lots of water .You can take an antacid like Pantoprazole
to reduce the symptoms.
If you have missed your period there could be chances of pregnancy
and these symptoms associated.
It is always advisable to visit your Doctor and get these drugs prescribed after examination.