Hi.
Thanks for your query.
Noted the history and understood your concerns.
Nausea is always indicative of some irritating thing going on in the body, particularly in the abdomen, hence the appetite is also lost.
Since you have cramps like
menstruation and also have
vaginal discharge the most probable cause can be
pelvic inflammatory disease that is causing all the symptoms that you have.
I would advise you the following in such a situation.
Get an opinion of your Gynecologist and also insist for tests of blood, stool and urine.
Ultrasonography of the abdomen and any other investigations as needed.
Further management would obviously dependent upon the per-vaginal examination along with per-speculum examination and lab.
Take only liquid diet and get started with a PPI like Omeprazole and
Domperidone as it will help for acidity related problems.
Keep clean personal hygiene.