You should do a serum beta HCG
test which is more specific than the urine pregnancy test.
Also, you may get an ultrasound
scan of the pelvis to rule out pregnancy.
If the tests rule out pregnancy, please get your thyroid profile done. Your symptoms may be due to Hypothyroidism
You can start yourself on multivitamin
supplements like Becosules or Zincovit. Eat regularly, do not skip your meals and start doing mild to moderate exercises.
You should be fine soon.
I wish you good health.