Hi thanks for your question.
Slight increase in size of breast and tenderness before period is expected and normal. Usually it is due to hormonal
changes which occur before menstruation
. However if increase in size too much,it needs to be investigated, for which you need to check your hormonal profile ,along with ultra sound
abdomen to rule out any endocrine disorder.
The enlarged, painful and swollen glands in your groin are most probably inguinal lymph nodes. These lymph nodes increase in size and become tender when there is infection in their vicinity. Faster heart rate
could be due to high blood pressure
and vice versa. I would suggest you to consult a physician who may be able to investigate you for all your disease ailments.
Hope this answers your question.