feeling very stressed

just completed my annual review with my boss on monday, although i did not do any significant contribution for the past one year,due to MIA for almost 4 months because of maternity, he told me that he will give me chance to 'recover' my performance again.. i was like.. i was out of office for 4 months ya.. but that is due to maternity, that should not have been covered under my performance as not performing at all, isnt that government's call for more babies by working mums?  sigh.. it is really hard to struggle with being a mum and a working mum at that.. however, i don't deny that i do felt that my passion and my performance have not been at the peak after my maternity.  Being a new mum, i am always worried about this and that at home and this and that at work and my forgetfulness seems not to have left me at all.. i actually missed out a global concall at 10pm today and have my boss calling me to dial into the conference.. but i really do not recall having that logged into my ical in the first place.. anyway will check it tomorrow and i think i really have to buck up.. otherwise i don't think i can continue to survive in this competitive environment..