Welcome to HCM,
After going through your history you started having symptoms after your abortion
, and your doctor find nothing is there but please discuss with her if there is any cyst or pathology can be detected with the help of Ultrasonography
In any case you can take a second opinion
from a Gynecologist.
Pain could be due to any infection,or trauma and ulcer which should be carefully looked in.
If there is nothing and you have intolerable pain then this could be because of spasm that is vaginismus
Irregularity of periods should be investigated and treated by Gynecologist, like DUB,Hormone imbalances, or even Thyroid problems.
You should try to relax and adequate lubrication by KY jelly should help, if problem persists then you may be required to consult a Psychiatrist/Sexologist
for proper therapy.
Please do not worry this can be treated and then have healthy and cheerful life.