I need a recharge

Lousy day at work. So many deadlines round the corner and the boss still piling with more work and all with tight timeline. Feeling really too overwhelmed, am struggling and felt that I may not be cut for my job. There is really no way I can complete all. Very helpless. Almost had the urge to go my boss and tell her I need to go on a break to recharge myself. 😢😢