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If you are terrified to get B's, it probably means you are an intelligent, motivated perfectionist (congratulations, this means you're a typical pre-med). This also means that it is highly unlikely you are going to let your GPA slip too far. One B (or even 10 B's and a C) is not going to destroy your application, but constant worrying about getting non-A grades will destroy any enjoyment you could be getting out of undergrad. Work hard but try to keep things in perspective.
On the other hand, your TA is likely a graduate student who is living far from home and doesn't have time to cook. A batch of fresh baked cookies would definitely be remembered when your lab reports are being graded...