Menopur?

Hi Ladies, I need some advice please as I'm feeling very weary and sad.

I have 4 kiddos (Boy 12, Boy 9, Girl 5 (IG successful sway), Boy 2 (failed IG sway but love of my life). I'm 40 years old, almost 41. Eight months ago, I started the IG diet to sway for another girl. I started out with the centrifuge, swim up, douching, etc. BFN too many times (and felt lousy-- my hair was falling out). Now we are following the GD diet and just BD one time at pos OPK for the past 3 months, but still BFN.

A few days ago, I went to see an RE about my conception troubles and now I feel especially discouraged. My FSH is 12.1, my AMH was 6.3, I have very few follicles left and they are small, etc. She doubted I could conceive on my own. She said that at my age, she discourages Clomid (but she'll give them to me if I want-- suggests 100mg). She suggested I try Menopur injections or IVF. Still, she was pessimistic about my prospects.

Atomic, what do you suggest?? I wish I hadn't wasted so much time douching and all that other garbage, but now what? I still desperately want a girl, but should I give Clomid or Menopur a shot? I want to avoid having multiples and I hear that is a real risk. :(

Thank you for any help you can offer.