I Have Been Taking 50mg Of Lyrica 3 Times Daily

I have been taking 50mg of Lyrica 3 times daily for several years without a problem. A few weeks ago I had a severe attack of Fibromyalgia and the Dr. increased the dosage to 100mg 3 times daily. Since then, I have had a problem staying awake during the day. It seems that if I sit down to watch TV, I fall asleep. This is a real problem for me since I drive a school bus. Could this have any connection to other presciptions I am taking?