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Originally Posted by merilung
So I thought I'd update since I finally made it to my first class! I remembered to hydrate all day long and that was clearly a very good idea - I never had the overwhelming urge to drink water during the class. I kind of wavered back and forth between feeling AMAZING and feeling nauseated/dizzy, so whenever I started to feel bad I sat down on my mat or just lay down in savasana. The instructor told me the goal for the first class was to stay in the room the whole time, so I didn't feel too bad about missing a few poses, and everyone seemed to be really focused on what they were doing and not worrying that I was skipping out on a bit of it 
However, when I got home I felt TRASHED - nauseated, starving, shaky and generally ill. It took me a 25 minute crash nap and two hours of rest to feel semi-normal again, though eating helped a LOT. Of course, when I did crossfit I felt like this after the first day of that, too, but felt ridiculously good the next morning, so I'm hoping for a really good morning tomorrow. Either way, I'll be going back at least 4-5 more times before I make a firm decision about it - I definitely get the impression that my body needs time to adjust!
YAY! i'm glad you had a good (or semi good) first experience. Yes, I will definitely get a blood sugar crash if I don't eat enough before I go. They say to not eat anything 2 hours before the class, but I'm fine with eating 1-1.5 hours before, as long as it's not something tomato-y or too crazy. I feel like you NEED a good meal before you go to class because you expend so much energy.
The nausea/dizzy during class will go away (although after a year of practicing I still can get it). I take that as a sign I'm working way harder than my body can handle so I just really slow it down and just BREATHE at that point if that happens to me in class.
As for the post yoga crazy tired EXHAUSTED feeling, that will go away in a few weeks or a month if you do it regularly. I remember when I started hot yoga I would stumble home and literally barely be able to take off my clothes and all i wanted to do was go to bed. after a few months I have so much energy after yoga when I get home I can cook and clean for hours before I relax.
So I would say, as it sounds like you are open to it, give it some time for your body to adjust, and then welcome to feeling AMAZING!
Did you get the post yoga high the next day? ;-)