Heavy Discharge, May Be Yellow Or Green, Occasional Blood. What Is It?

I hope you can help with my query, I had a smear test and swabs done in September because my discharge has become so heavy since May this year. No yeast , sexual or bacterial infection was found and I have been told that everything is normal. However this does not seem normal, my discharge is off-white/yellow, sometimes tinged with green, sometimes with blood . There is sometimes a truly very very large amount that comes out in the day (sorry to be graphic but probably enough to fill a small bowl). It has a very mild smell of mashed potatoes , and down below burns.... I try to not scrub there, just wash out with plain water when I have my shower in the mornings.... it is quite disturbing to me. Please can you tell me what you think this is?