New generic adderall making me feel very sleepy and nausea ?

I can completely empathize with your situation! Are your new generics a more 'pink' hue than orange? Taste much more bitter than the first kind you were on?
The generic that you might have is Corepharma.
Myself and some others I know with ADHD who also take Adderall I-R have had negative side effects with the Corepharma (sp.?) generic brand. Many places carry that generic in Adderall nowadays.
I personally always have my home-town pharmacy order my generic brand each month (they do this for me now automatically though so that's also a plus!) ; the generic I get are made by Teva. They are scored, orange, & football-shaped pills (interestingly enough, the Teva's used to be distributed by chain pharmacies much more widely).
I would double-check your generic but hope this was of some help to you!

Chances are good that it's the specific generic brand you are taking. I had the same problem after my pharmacy switched generic brands on me without telling me. Check your prescription bottle. If it is Aurobindo brand, or Barr brand, then that's almost certainly the problem. The Barr brand made me sleepy and a little queasy but the Aurobindo brand feels like I have been poisoned.
Please complain to the FDA via their Medwatch page about the Aurobindo brand. It is made in India and they have already received a warning from the FDA about their quality control problems. The form isn't too hard to fill out and we need to take a stand against our pharmacies stocking the very cheapest brands of our medications they can find. Complain to your pharmacy too. This brand seems to be toxic to a lot of people.

I am also taking the generic Adderall. For the first 3 wks I was miserable. I could not close my eyes! I wasn't energized at all from taking it. I had absolutely no physical energy, but my mind never slowed down one bit. Not nausea, but just pure exhaustion had me queezy. That was on 1 30mg am, and 1 30mg pm. Awful. They have played around with my dose for another 3 wks now. Im presently taking 90mg early am with no second dose in the afternoon because, I'm already an insomniac, so there's just no way. It seems to me the only thing different on the Adderall, at all, is I'm having migraines. No energy, no focus, mind going all night and day as before... I simply don't understand how this same rx, on a lower dose, twice a day, helps my sister with everything and fall hard and fast asleep at night. This is the first time taking medication for my ( recently diagnosed ADHD ) Im not sure how much longer to stick with this rx, its doing absolutely nothing for me. I hope you find a rx/dose that works for you. I don't think Adderall is for me. Good luck.