Chem's kicking my behind!

Chemistry has been really confusing so far. According to my professor and her faculty partner, they've decided that Chapter 13 from the book we're using and currently studying is the hardest chapter of the book. Nice. Way to start the semester studying something so difficult, I'm starting to doubt my abilities in figuring Chemistry out. In fact, I'm so confused I've been in a funk for about a week now. It's really getting to me. The Chemistry class has 4 components to it: lecture, discussion for lecture, lab, and discussion for lab. I have a horrible TA for lecture discussion who speaks as loud as a mouse and doesn't go over the homework problems. Thank goodness the rest is all done by the professor, but still, the material is very difficult. How can I be a doctor if I feel I'll fail this class?! So far I'm getting 100% in it, but that's with a TON of work.
Good thing I have other classes to lift my spirits. Physiology is great so far... all pretty much a summary of what I studied back in Cell Biology last semester. Both my quiz scores have come back at 100% as well, and I'm pleased to know I'm doing something right. My other class is Calculus I and that's my favorite one, believe it or not... I like studying limits. It's kinda fun. Plus I have a professor that's really good at teaching so it helps tremendously.
My research is also doing well. I'm close to figuring out a hypothesis- something to do with sexual motivation and people with blue eyes. More than 90% of them live in the Baltic area (Northern Europe, Sweden, Finland, etc), so I'm trying to figure out birth rates between those people and people with brown eyes in other parts of the world. There's still a lot to be done, but I love it. Recently I received in the mail a huge poster with all the chromosomes and selected genes (it was like Christmas!). Turns out the X chromosome is almost as big as chromosome 1, and the Y chromosome is very tiny, about the size of chromosome 22. Now I can see why women are so much more "with it" than men. We have a lot of genes!
Like I said, I've been in a bad mood lately, I think it's because of the routine change. I'm hoping to get over it pretty soon. Also it doesn't help I've been having an extreme bout of "mommy guilt". It always seems to hit at the wrong time.
My son's been kinda needy lately and won't go to bed on his own like he used to. I've been having to put him to bed 3-4 times/night before he actually stays there and doesn't get out. I guess he just misses me and wants to play, but I need to sleep too! (That's another part of the problem: lack of enough sleep).
I'm hoping to get enough help with Chemistry before I consider myself an utter failure for being in the dark so much.
Can you tell I set the bar so high?!