Did the Buddha say anything about attachment to meditation? I was unable to meditate today and this left me feeling frustrated, disappointed and anxious about my practice. This type of emotional reaction seems equivalent to what occurs when one is prevented from gratifying one's sensual desires. So, I am concerned about a potential addiction to meditation practice. Did the Buddha have anything to say about this? If not, any advice from others? Thanks.
One of the branch Bodhisattva vows is this : 


 Regarding the taste of bliss from gaining mental stability as its main advantage

  
  Normally, we tie up a great deal of our energies in nervousness,
  worry, indecision, thoughts of longing or resentment, and so on, or
  weigh them down with dullness and sleepiness. As we concentrate and
  absorb our minds ever deeper, we release ever greater amounts of this
  energy. We experience this as a feeling of physical and mental bliss.
  The stronger that bliss, the further it draws us into absorption. For
  this reason, in anuttarayoga tantra, we generate and use even more
  intense blissful states of mind than those gained merely from perfect
  concentration, in order to reach subtlest clear light mental activity
  and absorb it in the understanding of voidness. If we become attached
  to the taste of bliss we gain at any stage of developing mental
  stability, whether or not in conjunction with tantra practice, and we
  regard enjoying the pleasure we gain from that bliss as the main goal
  of our practice, we seriously hinder our development of far-reaching
  stability of mind.


While this was not exactly your problem the two are similar. 

Another advice I've received from a past teacher is to rotate my meditation types. Do each for about a month, and then rotate to the next one. 
Sometimes practice goes well, sometimes it does not. 
When it does not, watch your mind even in its reaction to the practice. 

Do not cling to any expected result, just accept what is... 
Even though it is not a buddhist text I'll quote the Bhagavad Gita here as it is relavent. 


  It is not those who lack energy or refrain from action, but those who work without expectation of reward who attain the goal of meditation.


I unfortunately do not have any direct quotes from the Buddha in my mind on this subject.