Hi.
From description you have either a medical issue or a severely incorrect seating position (well, both are possible too).
"Brick pedal shape" - I presume it's the floor mounted accelerator pedal rather than design preference.
Notice that you don't have to put your heel close to the pedal: you can press it pretty much anywhere to your convenience, it's just the higher you do the better the response.
Adopt the proper seating position the car is designed for:
. Notice that
the effect won't be necessarily immediate, which is a common trap actually: overcoming bad habits takes some persistence (properly applied, of course).
Compared to my previous car I had to finally admit I must sit closer to the controls to feel better (I have not a leg/foot but a back/neck issue). My initial wrong impression was that affected the clutching experience and still I finally found out I had to sit even closer to do it comfortably too. It took a few years only.
If you have sport seats consider increasing the seat (the cushion, not the backrest) angle.