If 50 worked well for you for ages (that's the amount in sequi), but then wasn't enough... and 75 is giving you symptoms of too much (which is what those sound like), then try 62.5.
You can cut an estrogen-only patch, yes.
I have PhD level patch cutting skills by this point, but only with Estradots and the best way to cut Evorels might be different...
If it were an Estradot... assuming it's a 75 patch, get your ruler out and measure it in mms. Divide whatever many mms it is, into 3 - because each third will be 25 and of course two thirds will be 50.
Then divide the remaining third (25mcg) in half, to get 12.5mcg - put some dots on the patch with a biro and cut.
Then in future, ask your doctor for 50s and 25s. Because then you can just cut a 25 in half and use a 50 and half a 25, to make 62.5. Which is much easier. Save the other half of the 25 for when you change the patch next time.