Thanks for your question on Healthcare Magic.
I can understand your concern.
Yes, it is possible to have
pregnancy despite of negative pregnancy test.
So better to consult gynecologist and get done
ultrasound examination of abdomen to rule out pregnancy.
If this is negative for pregnancy, you are not pregnant for sure.
Another possibility for your symptoms is
hormonal imbalance. So better to get done hormone levels and if imbalance then you will need hormone pills to regulate hormones.
Once your hormones are normalize, your all symptoms will disappear.
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.