Hi, Dr Purushottam Neurgaonkar here. I will suggest you the best possible treatment options . 
1 ) First of all do not panic. 
2 ) As you have repeated negative 
pregnancy test reports, you can safely assume that you are not pregnant.  
3 )  in case of doubt blood 
beta HCG test and USG will be of help. 
Please ask the sonologist to look for 
PCOS in the ovaries. 
4 )  if all tests are negative for pregnancy, then your symptoms can be due to Pre menstrual syndrome.  
5 ) I will suggest you Tab B LONG F, 
PRIMOSA, 
Vitamin E one each every night for 3 months. 
I will suggest you to indulge in a healthy diet and regular exercise regimen. Include more portions of fruits, salads and vegetables in daily diet. Avoid deep fried foods, bakery products and refined sugars. .
I hope this answer helps you. 
Thanks. 
Dr. Purushottam Neurgaonkar.