Going through a break up can be difficult and it’s very different for each individual.
It takes months or years to come out of a relationship and usually the intensity slowly starts to reduce. In your scenario it’s been hight disturbing even after 5 years of the breakup.
A few things to try before you could visit a psychologist-
1. Avoid attempts to know any kind of information about her
2. Look for other areas of your life that need your attention
3. Practice seeing this as a chapter of your life which is now over
4. See how you can be less affected by this each day
5. Engage in healthy relationships around you (friends & family)
Next Steps
Consult a Psychologist if this persists and interferes with other areas of your life
Health Tips
This is a concern as it takes away the peace of your mind and makes you dysfunctional in the day.