Just another thought.If you have difficulty with Letrozole and it doesn’t settle. Be aware that there are 8 (I think) different brands of Letrozole on the market in Australia. Whilst the drug itself is the same the fillers and coatings are not which may be causing problems for you so may be worth changing brands for a while.
I initially bought a brand from the local chemist which was fine but switched to one from Chemist King which was $12 less per packet.I used it for 3 months but found myself feeling quite low .I then tried another brand from Chemist Warehouse for the same price which agreed with me better which I have now used for 10 months .
Fillers and coatings is an often debated topic and from my own experience I would say there is some truth in people being sensitive to them.