Sorry for the lack of posting this week... I have a bad cold.
The Berdichiver brings a kabbalah from AR"I that women who are tzidkaniyos suffer no pain during childbirth because they are excluded from the onesh of Chavah. The word Anochi is representitive of the 1st dibra of Aseret haDibrot, which (as R' Tzaddok writes in many places) subsumes within it all positive good and mitzvos that Hashem desires of us. Rivka complained of her pain, "Im kein lamah zeh Anochi", if I am suffering from the onesh of Chavah, what in my relationship to that ideal of Anochi is missing?
My wife noticed that aside from its mention at the opening to the parsha, "anochi" is a recurring theme. Eisav's constantly uses the term "anochi" in describing his shortcomings - "ayef anochi", "hinei anochi holeich lamus". Ya'akov on the other hand is "anochi ish chalak", and has to disguise his "anochi" to become Eisav - "anochi Eisav bechorecha".
There is also an interesting contrast later in 28:15/16 - Hashem reveals to Ya'akov "hinei anochi imach"; Ya'akov replies"v'anochi lo yada'ti". Does Ya'akov's anochi refer to himself, or is Ya'akoiv perhaps saying that he has not been aware of the presence of Hashem as revealed through Anochi, capital A for that first dibra and its middos?
(For the pashtanim who have grimaced through reading this, a question - I am not aware of a rule as to where the term "ani" is used and where the term "anochi" is used. Any sources?)