Do you know how relieved I am, chandra, that it isn't just me? This started with my first preganancy 7 years ago (putting my purse in the fridge, forgetting appointments etc.) and I'm just as bad now. I put it down to permanent tiredness (even though I am no longer truly sleep-deprived, I am still tired all the time), PND, hormones, SAD, and motherhood in general!
I feel "muzzy" headed much of the time. I can't remember words, or names (and I used to be so good at names!). I constantly do what coppertop describes and put the wrong word in a sentence, eg., "come on, let's get you a nappy" when I actually mean "come on, let's get you a drink." Another thing, which is really weird, is using the wrong phrase to describe things - eg., "yes, we are going to go there yesterday." "I did that tomorrow."
And I am fundamentally unable to get the names of places right - I have said to dh "OK, I'll meet you in Mothercare" and then stood, cursing him, in Woolworths, wondering where he is. I MEAN Woolworths, but for some reason I SAY Mothercare.
I think the difference is, that you feel like this and have to manage studies and a job too. I am a SAHM, so it doesn't matter so much if I sound a little deranged and can't remember what day of the week it is. It sounds like you are in a vicious circle now where worrying about it is raising your stress levels and making the problem worse. I would see your GP again, don't be fobbed off. And see an alternative practitioner too - homeopathy, reflexology? And try and eat well, and get as much sleep as possible. Re:the writing down of things - carry a notebook everywhere and write everything down in the same place, then you won't forget where you've written it.
Hope it helps to know you are not alone - you've got so much on your plate with your child, your job and your studies - you're trying to keep so many balls in the air at once, and I bet you have no "me" time at all