When did you first notice first symptoms of possible endometriosis?

I have had very heavy periods for a long time. They seem to be quite short in duration literally lasting up to 4 days but the bleeding is very heavy to the point of sticking 2 pads together and putting in my pants to absorb. I then seem to get painful twangs in my tummy even when the period has finished. Im getting very painful twinges now and my period finished a week ago.

Is this endometriosis? What do you guys think?

I eat plenty of veg and salad and I try to look after my bowels and eating habits.

I am 39. Thankyou for reading.