Hello dear
I understand your concern
Pregnancy is not possible in presence of normal period because
Absence of period is most common and definitive symptoms of pregnancy.
Again your pregnancy test result was also negative.
Your symptoms could be due to
hormonal imbalance, thyroid dysfunction/
hypothyroidism.
I would suggest to consult gynecologist and undergo reproductive and thyroid hormone analysis to confirm cause.
Take small frequent meal
Do gentle
massage with evening prime rose oil
Avoid: stress, alcohol, smoking, excessive salt, spicy/oily food
Do regular exercise, eat healthy diet, drink plenty of water
Hope this may help you
Contact further if follow up needed
Best regards
Dr. Sagar