Weird periods

Al

Okay so I am going to try to make this post as short as possible but I have no where else to go because each doctor tells me something different. Okay so for about the past year I have been having weird periods. Like one month my period will be right on time but I will be in excruciating pain to where I can't walk, stand or sit and it brings me to tears. I feel it in my lower back and no matter what medication I take nothing eases the pain and I bleed a lot. I will bleed through super plus tampons in the matter of 2 hours. Then the next months period it's like there is nothing I start a few days early the flow is normal for what my periods used to be like, little to no cramps and is like the periods I used to have. I have went to several different doctors but no one can really give me an answer. They say it's normal or that my symptoms don't add up to any diagnosis they know of and no one will refer me to a specialist. I am currently in the month that is so bad it's unbearable and I literally have no idea what to do. Baths do not help nor does heating pads or anything else!!! Please help I am desperate on any advice or if anyone has this same issue!