Welcome to HCM,
Thanks for posting your query to this forum,
Your symptoms of nausea and headache could be result of withdrawal of oral pills
but usually they are mild and disappear with time.
The other possibility is migrainous headache which can be accompanied by nausea and vomiting.
If you are gluten sensitive then you need to go for test and if found positive you will be put on gluten free
diet ,there is no point in presuming that you are gluten sensitive and avoiding food items unnecessarily.
Please visit your Physician and this can be treated according to cause with analgesic
and anti emetics.
is there and frequent then some preventive therapy may also be given.
It takes 4 to 6 week to resume your period but if you do not get one take a urine pregnancy
test and further action depends on result.
Hope this information helps you.
Dr.Akhilesh Dubey M.D.