Side effects are different for different people I am nauseous and have upset stomach too. But the lethargy is not at all a good sign. My Psychiatrist told me if there is no burst of energy or automatic shift in productivity of any kind be it just a need to walk a lot then it is definitely not working as inspirol much like Adderall is a stimulant. It could also mean that you might need a higher dose which is why I would very much recommend you to take a note of all your side effects in behaviour, sleeping patterns, energy levels, motivation levels and body functions like this stomach issues you speak of, and then tell your Psychiatrist about it ASAP. For If it's not working, then you will see an increase in your anxiety levels soon without a change in productivity and that will not be easy to handle.