Maybe you can try eating real small things every hour or two, to give your body the nutrients that it needs?

Like, an apple or pear? Next time, a slice of ham & some veggie/s. The time after that, a healthy granola bar (like Luna ~ has lots of vitamins and protein). Drink water throughout the day and evening. Drink a fruit & yogurt (or ice) smoothie every now and then.

Please do give it a try. I have been on that underweight and nauseous road myself & had a tough time getting back up into a "healthy weight" to make things easier. I know that it isn't easy. ((((hugs))))