I have been on Wellbutrin xl 150 for about 8 months. I also take ...

I have been on Wellbutrin xl 150 for about 8 months. I also take 5 mg Lexapro daily, but am weaning off. I was recently upped to 300, about 1 month ago, since I want to eliminate the Lexapro completely. I have noticed I sometimes stutter or cant get my thoughts out fast enough! I am a nurse and work in the ER in a very fast paced environment. I thought it was just me, and I am worried maybe it is something else, but has anyone experienced this? I noticed it only after upping my dose??? also I am very concerned about the seizure statistics.. 1 in 1000 or 1 in 4000 people have seizures on Wellbutrin???? I never knew this, has anyone had a seizure from this? I am very worried!!!!!