Anxiety
"15 years old, severe anxiety.  My Dr. prescribed this medication for me to take on occasion when I needed it.  It worked beautifully, and I could go to dances and loud bars and restaurants again.  Although it did not removed my anxiety completely, it did get rid of at least 90%, and that was enough to get me through these situations.  However, very recently I have noticed that it has stopped working and instead gives me horrible dizziness and lets my anxiety roam free.  I do take another medication for anxiety as well as another for depression.  Anyhow, my gabapentin has been fought off by my body and I am going to have to switch meds again (I was on another medicine that I became immune to 4 months ago and have to switch then).  Sigh."