Argentum Nitricum
We call this the " I am worried that...." homeopathic remedy. You anticipate that something bad will happen and are worried or anxious about it.
This could be before a flight, or a sea voyage or an examination or a first date.
This fear or anxiety is causing you to have some loose bowel feelings, perhaps palpitations and a sick kind of feeling. Give Arg Nit a try, its brilliant at calming the nervous system