It's case of Mandagni and intestinal infection. Please see that you observe langhan for day that is fast or very light food once day. Food may be khichri. Sip max warm water boiled with ajwain. Once or twice a day put a pinch of black salt in a glass of water. Take Mahashankh Bati two tab twice a day and if vomiting still there take vomited tab 2 b.i.d with coconut water.
It work be advisable to go for a routine medical check up (let the doctor check you personally and diagnose it ). Gas problem is a common term used for indigestion and acidity. You can also read about indigestion or stomach problems from the internet. So the best way out is to bring discipline in the eating habits and maintain an ideal weight. Start your day with light exercise and have your breakfast which is nutritious (not junk food/ processed or packaged food and beverages ). During 10-12 glasses of water every day (drink more if you work hard ) If the problem persists then you can try Homeopathy which is very effective and can remove the chronic tendency. You can contact me for a private consultation.
I will suggest you to do suryanamaskar daily as per your capacity for a minimum of six months and Avoid spicy food items and not to eat junk food and we also need to avoid peanuts and potatoes in our daily diet