could this be a side effect ?

YES!
I found that every so often I would feel like that.
What I would do, when I found myself getting this way, was to have a day off the D. It worked and I became better at recognising the signs before it happened.
I think it was because the D gradually built up in my system and also my sleep patterns changed. Even though I felt like I did not need as much sleep and I had heaps of energy, my body was feeling the effects of lack of sleep or not having quality sleep.
I hope you are feeling better
Sharon

AW GREAT, i feel alot better today! i dont know if it was my sleep or if my duromine hasnt kicked in yet haha but i feel more lke myself thats for sure! yeah i thought about doing that too, but i dont want to slow down the pace of loosing weight, do you think if i skip it for a day itll slow down my process? im only on day 6, so hopefully as i take it more my body might adjust to the pill and i stop getting these side effects! thanks for commenting ive been following your blog too well done!!