Hi,
You are asking for symptoms from actual patients, so here's mine. I was diagnosed with endometrial cancer stage 3, ovarian cancer, stage 1 and cervical cancer stage 1 so it had been there a while.
My main symptom was heavy bleeding. First, regular cycle with heavier bleeding meaning the length of the periods was the same and the interval between periods was the same but I was now using the big, long overnight pads from Always brand, one a night. Before this I used tampons but no more, I had to go to pads. This came on suddenly, not gradually and went for 2 years while at age 42 I thought this was pre-menopause or something and I ignored it. Cancer doesn't "run" in my family and I was pretty young.
After one and a half years of this, one day "all hell broke loose". I woke up with a TIA on my right side. Luckily the stroke symptoms went away in a few days. That day was also the same day my super, super, super heavy periods started and I knew this "thing" had to come out. I started searching for a gyno to do a hysterectomy right away.
Another symptom I had was what a neurologist said was inflammation. Only 3 times and for only a minute or so, one eye would track off and I couldn't see. The cancer was responsible for the TIA and the eye thing.
Anyway, these super periods were ungodly heavy. The interval between them got shorter by 1 week, from 28 to 21 days, and they lasted days longer, up to 10 or 11 days. I was bleeding to death but it was taking a few months. Also in there I did see some clear discharge on a pad or two.
I had no pain, no bloating, no upset stomach, no cramps, nothing else but the bleeding. Oh, I did pass a fibroid one day and did have another day when the bleeding got stopped up and I had very painful super cramps that I went to the emergency room with until the bleeding started again with a gush.
Your gyno can prescribe progesterone to stop the bleeding and can also check your hemoglobin so as to see how anemic you are. Take it from someone whose hemoglobin got down to 7 something, anemia will make you very tired and weak to the point that you can't walk very far at all, stand for very long at all, think very well, etc.
My first test was an ultrasound, vaginal and abdominal. They only saw the "complex mass" on the one ovary and said nothing about the uterus. I saw the ultrasound report and they didn't see a stage 3 tumor in my uterus. The pathology report later said that the uterine tumor was 75% through the uterine wall which is deep. So beware of a doc telling you that your ultrasound is clear. They can miss some important pathology with those. But I did have uterine fibroids which may have obscured the ultrasound's view of the tumor.
I have read that they can also do an endometrial biopsy which is, of course, what I would suggest.
If I've left anything out and you have more questions please let me know. Obviously I wish I would have caught this thing when the heavier, but manageable periods started.
I am now on 6 rounds of carbo/taxol that will be followed by 5 weeks of radiation.
Good luck!