this causes chills or sweats, heart palpitations, nausea and
vomiting, leading to syncope (passing out, fainting
) I have this.
3. neurocardiogenic syncope: formerly called vasovagal syncope, can be triggered by 100s of different things, including eating, needle stick, sight of blood, etc. I have this
4. post-viral dysautonomia: episodes can be triggered by viral infections such as cold or flu. I have this.