Finally had my '2 week urgent referral' with Gynae consultant this morning (after an 8 week wait).
It was really great and he was 100% clued up on WLI - he suggested that the drop in weight impacts the ratio of oestrogen in the body (ie it becomes more) so ovulation starts again (this would fit my bleed patterns which are full on periods which have started every 3 weeks and then stopped after 7 days - I have had 3 since starting MJ on 1st April).
He believes it will settle in time but that the progesterone is necessary to protective to the womb lining against oestrogen - which thickens and then sheds as a bleed as the ostrogen ration has increased. I told him that I had taken double progesterone and that my GP had put me on a waiting list to have a coil fitted (to ensure prog dose is absorbed and by-passing the stomach). My double prog hasnt kicked in yet (only been doing it a few weeks).
However I still had to have the hysteroscopy this morning as the ultra sound showed thicken endo and a polyp - so had the camera and biopsy taken. Will hear back in 2 -3 weeks.