Excess production symptoms and conditions

I began Lamictal in Jan 07. About a week after I began it I noticed excess production of phlegm. I mean crazy phlegm production to the point I needed to spit every few minutes. I also noticed that I began to have difficulty breathing at times. I had no rash.
In February I developed a fever, chills, shortness of breath, severe fatigue and severe leg cramping in both legs. I thought I was having a heart attack it was so bad. I went off the drug and the symptoms subsided however now I am severely fatigued at times and my breathing is still not quite the same as it was prior to the medication.