Too many things to guess at, but this is a signal that should not be ignored if it persists.
Sounds like a stroke.
GERD
Nausea can occur when input from the vestibular apparatus regarding position or movement differs from what would be expected based on experience. (Motion sickness.)Other stimuli that can cause nausea are:noxious odorsvisual stimulichemotherapy
Adolescence.
Worms usually cause vomiting because it feels there are butterflies in the stomach that cause nausea.
yes
Several factors could cause your legs to give out and result in a fall. These include sudden muscle weakness, fatigue, or cramping, which might occur from overexertion or dehydration. Neurological issues, such as a seizure or fainting, can also lead to a loss of control over muscle function. Additionally, medical conditions like low blood pressure or certain heart problems might cause dizziness and weakness, leading to a fall.
Drinking seawater would significantly increase the amount of salt in the bloodstream and leads to dehydration. Nausea, weakness and even delirium are the effects of being dehydrated.
a spider bite.
Diabetes can cause all of those symptoms
Pregnancy would be a common reason to cause nausea in a girl after sex.
Ricin would be suspected in this case.