I am a 34 year old male who has been given biaxin 500mg 2x daily for whooping cough. I do feel better with the cough, but I feel like my insides are coming out of the other end of me! And just a terrible bitter taste in my mouth, like right before you throw up. I am also on singulair which has similar symptoms of jitters and mood swings, along with dizziness etc. This is really strong stuff, I am very fatigued.