Hey!!! We have the same freaking wardrobe!!! I think I only own 1 pair of jeans and 2 pairs of dress pants from when I had my first kid, needless to say most days are spent in ugly trackpants and assorted ugly stained shirt. The "transition" I made from one to two was exactly the same as from none to one......neither of my pet monsters was planned. I had always said I would have none or two, preferably none....oh well, now I have two and as I always knew its not something I would ever regret. My girls are 26months apart and I think I would have preferred 3 years...an 18 month old doesnt care if you are feeling too crappy to carry/cuddle/whatever her, and when that new baby came home the two year old didnt quite get why she now had to share her *everything*, especially the boob. ok, I know I am rambling, but I havent had enough coffee yet.
Weight-wise, I lost all but 5lbs by the time the big surprise was upon me...I had gained almost 50lbs with her...this time I lost another ten before gaining 30 (so, would that mean I gained only 20 lbs?). I dont know if its normal to gain less with the subsequent children or what, but it might be if you are having to chase after said kiddies....so now, my 2nd is 12 weeks old and I have lost about 17lbs, it would have probably been more, but my voracious sweet tooth and tandem nursing has been overwhelming my appetite (pretty good at shifting the blame from my lack of will power, eh?).
oh, and as for the losing my mind thing....it was gone a looooooooonnnnnnnnggggg time ago. I still cant believe I have any kids, never mind two.