Hi both, yep I definitely have the crashing fatigue and foggy brain too. I get a weird 'I'm here but not in the room' feeling too, if that makes sense? When the fatigue hits, it usually lasts hours, not days, and I often    feel nauseous and shiver.
Although I've had a blip recently, I still feel the pill is a positive way forward in peri. From months zero to seven, my life has changed massively. The fluctuations that I still had with 50mcg patches disappeared as did the headaches. 
I like the fact Qlaira is bio identical and has a less progesterone dominant progesterone. It's a great 'bridge' for peri, especially as it reduces bleeding massively. On the down side, the fact it's bio identical means it's not as strong - a 2mg dose is less potent than a 2mg dose of synthetic estrogen. That's why I think I may need a stronger pill (all others are synthetic and tend to be 3 mg or higher) or else a 100 -200 mcg patch (enough to suppress ovulation). I'd recommend Qlaira to anyone considering the pill as a stepping stone to something stronger if required?
In answer to your other question, the pill GRL takes is the same as Microgynon which is the first line to prescribe for most doctors, being cheap and relatively safe (levonorgestrel is second generation). It's on the far left of the ladder, meaning it's more progesterone dominant. It's the same progesterone as in the Mirena. The pills to the right are more estrogen dominant and may some allegedly have fewer side effects, in general, as they are third generation. The big but is that they are more risky in terms of DVT. The one I'd love to take is Yasmin - it is recommended for those who're worried about head aches, spots and hair loss, plus it can reduce bloating. However, there are more concerns with its progesterone than any of the others.
Do read what Nick Paney said about the pill and which are best for fluctuations/Pms - he is well regarded in the meno world.
Above all, I think the key things to remember are: everybody responds differently to the same hormone combination; what works for one may not work for another; the pill is not perfect but nor is it permanent - you can stop at anytime, unlike implants or a coil. It does suppress ovulation, so if taken back to back, it's likely to prevent the fluctuations us ladies in peri menopause so often experience.
Really hope you find something to suit you soon  

Xx