Endometriosis?

So, I'm on my period and honestly I am very paranoid when it concerns health. I googled endometriosis and it highlighted the symptoms most women have during a regular period, I had cramps for awhile until I took midol and they lessened but they're still a small, dull ache so I looked it up and it said... show more So, I'm on my period and honestly I am very paranoid when it concerns health. I googled endometriosis and it highlighted the symptoms most women have during a regular period, I had cramps for awhile until I took midol and they lessened but they're still a small, dull ache so I looked it up and it said painful periods are a sign of endo, but I always have panful periods. Can someone tell me what true endometriosis consists of?
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