Anyone help?

Just looking for some answers from real women before I go see my male doctor who never seems to understand or care about anything, useless ha ha :) 
​I'm now on cd 52 with no af my last period only lasted 2 days. I've had a sore lower back off and on for weeks now, my nipples have been sensitive and erect for about 4 days, woken up every other night with stomach pain and been suffering with gas for about 2 days now. 
​I normally have a cycle ranging from 30-35 days and my period always lasts for a least 5 days.
​I have tested numerous times and no surprise all bfn's so I'm not expecting to be pregnant.
​Just wondering if anyone else has been in this position? Should I be worrie there is something wrong? Because I am. My husband and I are actively trying. I have had regular periods for the past 11 years and I have never used BC nor any other medication that could effect my period.
​Any help would be appreciated!  

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