Good luck with your appointment. I think it is a disgrace that women are left with such symptoms for so long and expected to just endure them. That is why there was a recent change in parliament. I hope you get an ultrasound and any other tests you need to get to the bottom of it. There are many causes of abnormal bleeding.

Personally, I have had daily bleeding for 18 months...sounds surreal when I think of how much time has passed. I had a DNC and hysteroscopy in July 21 and no abnormal cells. I had a very thickened endometrial lining and was bleeding very heavily, causing fainting on several occasions. I am still awaiting a hysterctomy, but am managing the symptoms with a double dose of the progesterone-only pill daily, which has reduced the bleeding to just streaking. But, I have no fibroids, no polyps and no cysts and no real explanation as to why my endometrium is constantly proliferating. 

I also have pelvic and lower back pain, but I do get extreme pelvic pain due to IBS, which is mostly kept under control with daily medication. 

The only 'advice' I could give you is to take daily iron tablets as the extra bleeding can cause anaemia, and tiredness. Most likely, your doctor will test for that. I just get multi-vitamins and minerals from Wilko which have 100% of the recommended daily allowance. 

All the best for some answers and relief from your symptoms.