 [ Symptoms ] had a period in april spotted may no period june and nothing for july yet took a hpt 2wks ago negative pregnant  had sex recently gained weight during this time and very bad stomach ache 1 day for the last two months had cramping with no period [ Disease ] yes it is possible to be allergic to a milkshake or other dessert made from ice cream but not to plain milk you may be reacting to one of the other ingredients found in these desserts other than milk but it is also possible that exposure to the cold is triggering some sort of reaction mcdonald is lists the specific ingredients that are used in their desserts on their website besides milk and ice cream other things that may cause an allergic reaction in some people include peanuts almonds sweeteners preservatives chocolate flavorings wheat and artificial colorings talk to your doctor about a referral to an allergist testing may help narrow down the cause of your symptoms in the meantime avoid any food that has caused a reaction in the past