Nervous about class tomorrow?

So recently I asked a question relating to how my anti-depressants weren't working and it was effecting my school work. I couldn't get myself out of bed until noon. I am talking to my doctor about this and possibly changing my medication. (Currently on Wellbutrin).
Well, tomorrow is my early morning class and I am determined to stop this cycle. I missed some class because of my medication not working.
I'm afraid my professor will give me a hard time and I am not comfortable telling him about my issue.
I know this is my responsibility, but I just don't know what to do if he demands to know why I was not in class.
I know this may sound stupid but please help me? I'm a very shy person and I don't like to talk to professors to begin with. I was thinking about emailing my professor about it, so he doesn't need to ask me in person. Do you think that is a better idea?
Nervous about class tomorrow?
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