hello, your abdominal pain
and backache can be due to groin hernia
. most groin hernias need surgical treatment
along with treatment of underlying cause, if any. Undescended testis
needs to be evaluated and brought down into scrotum before 2 yrs of age. Bringing it down after that does not save the semen producing tissue of the testicle. However, such testicles are more prone to tumors, so bring the testis down at any age ensures that you can examine the testis regularly and any tumor can be detected early.
Passing semen in sleep and ejaculation are different things. Often, "semen" passed in sleep is not complete ejaculate, and may be watery.
Consult your urologist
for hernia and undescended testis. He can also evaluate you for fertility issues.