I had a ovarian cysts rupture. A few months ago and I have been losing hair I have a very big patch of hair missing is this normal?

No . Your loss may not be related to your ovarian cyst . Various diseases will cause hair loss from chemotherapy , depression, thyroid problem , ringworm fungus infection, your description looks like ' alapecia aereata' or patchy baldness due to autoimmune diseases or ringworm infection. .First see your family doctor after medical check up will refer you to a skin doctor.