Congratulations on your pregnancy. You sound like you're about as far along as I am!
Abdominal bloating is caused by foods that your body is sensitive to, usually due to a leaky or damaged gut. You will have to experiment with your diet to figure out which foods bother you. Common offenders are wheat and gluten containing foods, soy, and dairy. Eating the foods that bother in smaller amounts less frequently will help. Taking probiotics and digestive enzymes and eating raw foods with each meal will also help you to digest your meals better. Bloating can also be caused by too much yeast in the gut. You eat a high-carb meal and have bloating because the yeast converts all the sugars (which are only digested in your mouth, a good reason to chew your food thoroughly!) to alcohol and carbon dioxide in the gut. Again, higher-protein meals, chewing food thoroughly, enzymes to help digestion, probiotics will all help. You can drink plain kefir or bulgarian style buttermilk with a meal, add plain yogurt, or take capsules of acidophilus and other beneficial bacteria. Capsules should be refrigerated, if they aren't sold in the refrigerated section they may not be worth buying.
For nausea, ginger or peppermint tea. Foods containing ginger can be helpful, but remember there is a lot of sugar and other ingredients you may not want to eat every day in ginger cookies. Candied ginger is yummy but very high in sugar. And soda is a no no throughout pregnancy. The phosphorous and carbonation strip minerals from your body that you desperately need during pregnancy.
Most important is eating many small meals or snacks. Preferably high-protein and free of preservatives, additives and sugar. Hard-boiled eggs with salt, cheese and celery, cucumbers, or all natural whole grain crackers. Organic peanut butter or even better, almond or cashew butter. Chewing raw almonds thoroughly will help not only with nausea, but with heartburn and leg cramps. Sweets, even just fruit, eaten right after getting up, can make your blood sugar go up and then crash hard. I feel faint if I drink a glass of OJ in the morning before I've eaten. If you feel nausea mostly in the morning, try eating a small snack when you get up to pee in the middle of the night.
Foods to avoid are hydrogenated oils, sugars, additives, colorings, preservatives, nitrates, MSG.
www.blueribbonbaby.org is the diet that many midwives recommend, and that is taught in Bradley childbirth classes- I try to follow it myself.
HTH! There is lots of conflicting dietary information out there. You'll just have to sift through till you find something that works for you.