Lining too thick then too thin

Madison

I have PCOS so I have irregular cycles and can a while without one. I was going through a period of having cycle bleeding every two weeks.

Went to the doctor and he determined my lining was too THICK. Took Prometrium August 27th-Sep 9th to bring on a cycle, it didnt work.

October 15th-24th took Provera, finally got a cycle November 1st-10th, very heavy bleeding. I went to doctor on the 5th, took Letrozole CD 6-11 @ 7.5mg. I went back on 13th and he said my lining was too THIN and the meds weren't working.

Now on to another cycle. He said call when I get my cycle or if I go over 40 days which will be Dec 10th and if I take Provera that means my cycle will probably start around Christmas.

Had to vent a little. Does anyone know how to get a good lining?