have never spared oneself; expend all one’s energies ❍ 贾湘农回到家乡做了几年工作，真是～呀！ (梁斌《红旗谱》226) During the few years since Chia came home to work,he had never spared himself.
费尽心血fèi jìn xīn xuè
比喻非常尽力。spend one’s blood, with much ado, expend all one’s energies