I had the same experience. I only took 2 doses. I had brain fog, was dizzy and just felt unwell. I did not continue with it. I am currently on gabapentin. I have been unable to titrate up higher than 400mg per day. I take 100mg in the morning and 300mg at night. I think it helps with night time nerve pain. Higher doses made me feel unable to function or drive (my husband depends on me to drive). As with Cymbalta, I get brain fog and feel very lethargic if I take a higher dose.