Hi Dr. Purushottam welcomes you to HCM virtual clinic! Thanks for consulting at my virtual clinic. I have carefully gone through your case, and I think I have understood your concern. I will try to address your medical concerns and would suggest you the best of the available treatment options. Yes severe sinusitis can cause nausea, as there is blocked nose and less sense of smell. But certainly it should not cause you vomiting. But at the same time nausea and vomiting can occur because of initial days of pregnancy. I will suggest you --- 1) take small frequent meals 2)Tab DOXINATE twice a day 30 min before meals 3) Avoid bakery products, deep fried foods. 4) Add Folic acid, B 12 , Omega 3 , multiple micro nutrient supplement to your daily diet. I hope my answer helps you. Thanks.