Hmm...the "light headed" is just normal, it's just the rush of euphoria the dopamine gives off. 10 days to smoke an eighth to yourself is actually really pacing it, I usually go through an eighth in 5-7 days by myself but thats because I roll a blunt in the whole mix but even if I just smoked bowls, I don't think my eighth would last that long. Sometimes in one session I pack full bowls, take some hits, leave it, come back later and finish it off, or I just pack a half a bowl, 2-4 hits and just kill it off there in one session. I don't think you have anything to worry about if you go through an eighth in 10 days.