 If you liked
Heppoko Jikken Animation Excel♥Saga
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 ...then you might like
Chuunibyou demo Koi ga Shitai!
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Just like Chuunibyou demo Koi ga Shitai, Excel Saga features a blue-haired heroine who is very sick. Excel Saga's Hyatt tends to vomit blood every couple of seconds due to her laughably weak constitution. In a similar fashion, Rikka is shown to shed blood by biting her thumb in order to augment her magical abilities (at least in her fantasies, anyway). Moreover, while Hyatt is always physically ill, Rikka is always mentally ill.