Advice pls thickening of womb

Hi I was seen under the 2 week wait as been having changed down below yesterday. Was confirmed as having lichen sclerosis. When I had a scan they said my lining was 19mm and they took a biopsy at the appt, ouch is all I'm saying lol. I was also fitted with a coil as he thought it is the start of endometriosis. I was also seen last year and my lining was 9mm at the same time of my cycle day 8 so the lining has definitely thickened., also has a punch biopsy which showed chronic inflammation On the camera it also showed. Polyp in my left side as I always get pain there after my period. He is going to review me in the vulva clinic in 3 mths time to see if the creams are working. My question is, is it normal at 19mm and is this why they did the biopsy as to be honest I just went with the flow lol. I'm 41 so wasn't sure if it's age related 

many thanks in advance xx