सीदन्ति मम गात्राणि मुखं च परिशुष्यति। वेपथुश्च शरीरे मे रोमहर्षश्च जायते ॥

sīdanti mama gātrāṇi mukhaṁ cha pariśhuṣhyati vepathuśh cha śharīre me roma-harṣhaśh cha jāyate

My limbs fail and my mouth is parched, my body quivers, and my hair stands on end,

In plain words: Arjuna describes what is happening to his body. His legs feel weak, his mouth is dry, he is shaking, and his hair stands on end.