Thank you for the query.
The pain caused by ovary and itching in the anus are rather unrelated. However close to the ovary there is a large intestine, and maybe this is what causes the pain.
Anus itching can appear with hemorrhoids, rectal fissure or pinworms. Lower left abdominal pain
can be caused by urinary tract infection
(usually frequent urinating and pain while urinating appears), diverticulitis
As hemorrhoids and diverticulitis ca both appear because of constipation, it should be considered (if you have had constipation).
Fresh blood in stool
(on the surface of it) is characteristic for hemorrhoids.
Pinworms usually give itching in the morning.
I suggest you to visit your doctor and rule out mentioned conditions. Abdominal ultrasound, blood work, rectal examination
should be performed. If pinworms seems probable, adhesive tape should collect larva and should be checked with microscope.
Hope this will help.