Hi I've been taking the Modafinil I received for the past few days. I started off at a really low dose 50mg the first day as I am 4'10 and weigh 87lbs. I have slowly ramped up to 200 mg since last Sunday and don't feel any difference in my focus or anything. If anything I'm yawning MORE than normal. Is it just taking a while to kick in? FYI I have never taken amphetamines of any kind so it's not a tolerance. Any insight would be much appreciated.