Dull Pain in the ring of the penile glans when I have an erection and contract the muscles there. Worse during orgasm. Like penis head trying to pop.

Glans pain. You may have an infection. If you are uncircumcised you may have phimosis, a tight foreskin that does not fully retreat. In any case, please see your doctor. Peace and good health.
You Need exam. Please see a doctor or another health care provider comfortable with genital infections to be diagnosed and treated .