What Causes Irregular Periods With Stomach Cramps And Excessive Diarrhea?

Hello, and thank you any one who is looking at my post. I have been on my period for the past 2 years 10 months. It started not long after I turned 20. I used to have regular period, one a month for 3-6 days. Then all of a sudden my one period turned into the nightmare of my life. A month had past and I looked up online and it turned out having a period for 28 days or so is a common thing so I just let it slide and waited a little longer. At 2 months I went to the doctors and they took a urine test. They freaked out a little bit because there was blood in my urine tube and said this could be very dangerous and sent me up to the hospital. I tried explaining to the doctors that it wasn t blood from my pee it s because a bit of blood from my period fell into the tube but no one would listen to me. The test came back and my urine sample was normal, no blood, except the nitrate levels were a bit high. I was passed from doctor to doctor over the course of 7 hours and they eventually sent me home and said they ll get in contact with me for a gynaecologist appointment This never happened, all though I harassed them for about 6 months trying to get an appointment alas to no avail. I honestly don t know how much longer I can keep this up. I ve spent a small fortune on sanitary pads, I m tired all the time, I feel weak, I m extremely painly. I get stomach cramps from time to time and excessive diarrhoea. My vagina feels bruised all though it s not. My flow is extremely heavy, so I can t go out any where. Moving around a lot seems to make it worse. So I ve since just become a hermit in my house. I ve put on about 8 stone since this started. I do try to exercise, I ve tried a handful of diets, none of this helped. I m slowly losing the will to get up in the mornings and I m extremely on edge all the time. :( If anyone can help with any answers it would mean the world to me.