Hi,Dear thanks for the query to HCM virtual clinic.
I studied your query in full details updated from you.I understood your health concerns.
Based on your query data, In my opinion ,You seem to suffer from 
dysmenorrhea with incidental finding of ?Lump on abdomen,which seems to be fatty globular tissue of the abdomen,which felt like a ball.There is no connection of this Lump  with the lower 
abdominal pain.
It could mean due to  lump in lower abdomen,if the size and depth of the lump indicates it as the lump coming from the abdomen and connected with lower abdominal pain.-In that case it could be TO(Tubo-ovarian) mass, or could by Ovarian Cyst(Benign/ Malignant) or a 
Fibroid uterus,which needs to be ruled out by 
Second Opinion from Gynec Surgeon and after USG abdomen and /Ct study of abdomen if need be.
Thus Second opinion form Gyne-Surgeon and USG of the lump would resolve this issue.
Hope this would resolve your query and worry.
Welcome for any further query in this regard to ME.I would love to help you out.
Awaiting for any further query.
Wish you fast recovery from this intriguing health problem.
Have a Good Day.
Dr.Savaskar M.N.
M.S.Genl-CVTS -Senior Surgical Consultant