I had exactly the same feelings the first time I collected my HRT and I'm only on 1mg! I nearly had a menopausal breakdown at the pharmacy in Sainburys because I wasn't sure I was doing the right thing at the time by starting HRT and then thought the cheek of it having to pay double - I even made them get their little book out to show me that it was for 2 prescription charges and I got a receipt just in case they were wrong!
I did feel annoyed at the time with my GP, as I did ask her if I had to pay for the prescription because I wasn't sure if it was free like the pill, and she just said yes but didn't mention the double price.
I started a thread the same as you when it first happened. The other annoying thing was my periods haven't been regular so when I went back after the first 3 months, she only gave me another 3 months (and another £14-80 paid out!). This next time I'm hoping to get more of a supply as they seem to have regulated a bit better now.
Hope you are doing well on your HRT.