You need to go back to the doctor who did the hysterectomy
and explain the problems you are having. If you do not have
medical insurance, you might be able to negotiate a lower fee
with the doctor. Your health is important, so make this a
priority and spend some money out of your own pocket if you
need to, so that you can at least have a consultation.
If your symptoms are urgent and they sound like they are, you
could try going to an emergency room where they are obligated
to treat you whether you have insurance or not.
I do not know why anyone would think a 24 year old is at risk
for ovarian cancer as it is extremely rare at your age. I don't
know what the circumstances of your hysterectomy were, but I
would consider contacting the Cancer Treatment Centers of
America and talk to someone about your situation. You could
also call the American Cancer society for a referral. I would not
go back to the doc who said you are at risk of ovarian cancer
and wouldn't help you, instead go to a new gynecologist or the
one who originally did your surgery. Find the money somehow
to at least have a consultation.