Get a PAST recoil pad. It slips over your shooting shoulder and tames that recoil.
Don't get me wrong, but "a bit of a headache" today will develop into something much worse as time goes on.
Your body is giving you a warning. Heed it.
I had a good friend who felt he could handle recoil from anything chambered in a rifle. He paid for that in a very nasty manner, when an Aneurysm, caused by shooting too many hard recoiling rifles/shotguns burst. He survived, but was partially paralyzed for the rest of his life, ending his shooting/hunting/fishing in his mid fifties.