I also do not think so.
Any doctor can suspect but can not confirm I B S in 4 minutes.
Stomach pain,nausea,headache for a week only , are symptoms of
stomach Flu not I B S (
Irritable Bowel Syndrome).
In I B S , there is long history of pain abdomen,motion several times a day with blood & mucus.
First of all , doctor will exclude parasitic & bacterial infection.
You can take O R S ,Ant Acid available on the counter.
You need prescription of a doctor .
For nausea -tablet domperidon + ranitidin
For pain abdomen -
dicyclomine or hysoimine or drotamine.
for headache -
paracetamol.
to confirm I B S ,consult your doctor(gastero enterologist.
Hi will perform colonoscopy/
sigmoidoscopy .he will visualize the colons & can take a sample ( biopsy) to confirm diagnosis.
You have to take medicine regularly for a long period.