Groin lymph nodes usually become swollen when there is an injury or infection in the foot, leg, groin, or genitals.
Swollen groin lymph nodes along with severe lower abdominal pain may indicate a serious genital infection.
Pain or cramping in the lower abdomen, feeling of fullness, pressure or bloating, unusual vaginal discharge that may have a foul odor, painful intercourse, painful urination, irregular menstrual bleeding, and a general feeling of illness or tiredness, are symptoms of pelvic inflammatory disease.
PID is an infection or inflammation of the female upper reproductive organs, including the womb, fallopian tubes, ovaries, and the tissue surrounding these organs.
If all of these symptoms are accompanied with heavy, long menstrual periods, you should be checked for endometriosis (when the endometrial cells of the womb's wall, appear and flourish in areas outside the womb cavity), too.
Another condition that can give similar symptoms but with more prominent gastrointestinal problems like changed frequency and form of stool, feeling of incomplete evacuation, along with abdominal pains, is irritable bowel syndrome.
Since you have history of alcohol abuse, symptoms of severe abdominal pain, especially in the upper left area, with swollen and tender abdomen, nausea, vomiting, rapid heart beat, sweating, fever, must be taken seriously as a sign of acute pancreatitis.

Ask your physician for pancreatic tests and see your gyn!