That morning sickness sensation is overnight dehydration. I know of some who had that and got into a habit of waking up in the night to drink some water (kept glass on nightstand). Another just woke up a few minutes earlier and drank some water, then waited for it to kick in before she got up.
11 years post op DS
There is room on this earth for all of God's creatures..next to the mashed potatoes
Since you just had your DS about 6 weeks ago and you're now only 5-10 pounds from goal, you need to start adding carbs to help slow your weight loss. For me the weight loss slowed as I naturally started to eat more and add more carbs the farther out from surgery I got. It took me almost 10 months to lose all my excess weight but I had the DS in one stage. You probably need someone who was a two parter (VSG first then the switch later) to answer your question directly.
Check with your surgeon before resuming your exercise, since you did just have MAJOR surgery less than 2 months ago. My surgeon had me weight approximately 4 months before I could exercise. Ironically when I exercise, I do it not to lose weight but to tone muscle. Don't do any cardio - you don't want to burn calories because then you'll simply have to replenish those burned calories. My "cardio" amounts to walking 1 mile on a treadmill.
Can't help with the morning sickness question but seems like Val had the right answer for you.