welcome to HCM.
if all are sick in the family,
then u may be right in thinking of food poisoning
etc. vomits/ diarrhoea may follow.
do husband and son also have pain, nausea?
if unwell , pl. get medical help
till then can chew anti-emetics like ondansetron
and antacids. simple pain killers like paracetamol
keep posted on progress...