Severe Abdominal Pain During Menstruation: Possible Endometriosis?

Hi. I have just joined and I'm going to tell you my symptoms. Every month after I stop ovulating I have severe pain in the bottom left side of my abdomen. It can last upto a few days into my period. It's always at the same time every month. It starts off with slight pain and as the days go on I have extreme pain to the point when I cannot walk properly without being hunched over. The pain goes into my left hip and hits the nerves all the way down to my ankle. It hurts to pee when I'm in this amount of pain. I sit on the toilet and it's fine untill I let my pee out and then I'm almost crying mid pee. When I sit down I have to sit very slowly and carefully because the pain that shoots through my bum is unbearable. I have 2 kids. 9 & 2. My 2 year old daughter is always climbing and sometimes she will climb onto the sofa and elbow me in the stomach and let me tell you, the shreik I let out everytime is awful. The pain is that bad I cannot pick my daughter up or stand up with a straight back. My gyne told me I have ovulation pain but the doctor thinks I have endometriosis but I'm unsure. Im now on the copper coil but my periods have always been really heavy and irregular. I'm just wondering if anyone else who has been diagnosed with endo experiences the same kinda thing? Obvs I haven't been diagnosed yet but the doctors are struggling to find the cause. I've been re-reffered to the gyne to see if they can do a laparoscopy to see if they can find any scar tissue. It hurts so bad sometimes to even have sex too. I know it's a long read so if you've taken the time to read this then thankyou so much. I'm at the point now where I don't know where to turn and when I saw this app advertised I soon downloaded it lol