ou are right to push for further investigation; unexplained infertility is actually no diagnosis at all. What this means is that they have failed to find out what is wrong. It is sometimes given to patients when the couple has been inadequately investigated.
I have had endo since starting menses at 14 (I realise that now) but at the time it just was not recognised by anybody medical and my mother had no idea what was wrong with me.
My main symptoms were heaviness of period, brown (old) blood like brown stingey bits and pain (oh the pain); pelvic pain, rectal pain, pain down both legs (sciatic nerve). Also had stomach pains to boot (endo can get onto the intestines and I remain convinced that some but not all women who get diagnosed with IBS actually have endo instead). All these are actually classic symptoms of endometriosis.
The four classic symptoms of endo are:-
painful periods
deep pain during sex
pelvic pain (continuous or cyclical)
subfertility
Other symptoms may include:-
heavy periods
pelvic mass
bowel symptoms
bladder symptoms
cyclical pain, swelling
In general any symptoms that are cyclical in nature and that get worse during menses may be due to endo.
It is also the second most common gynae problem seen in women after fibroids. I would like to point that out as a GP told me that endo is not common. He was completely wrong there. Many GPs to my mind are pretty much not up to speed when it comes to gynae issues and thus mess around in ignorance. A patient should always be referred if presented with the above problems.
As my periods were and remain irregular in nature (this irregularity has a different cause and was diagnosed initially by the gynae) I did not suffer this every month thankfully but my periods remained very bad for many years.
I eventually had diathermy surgery for another reason (PCOS) and at the same time the surgeon lasered away the endometriosis. It was extensive throughout my uterus and entire uterine cavity (saw the photos about a week post op!). No wonder I had been in such pain for all those years; I told the gynae as much at the time. I do get the occasional flare up a decade or so on from the op and it has recurred but I am far better these days than I was in my 20s.
[www.endo.org.uk is a good website with lots of information on it.
Endo requires careful management; see the best gynae you possibly can. You need to find a person with an up to date knowledge and understanding of endometriosis; ask outright how much experience they have had in dealing with this disease.