Hi ! Welcome to Healthcare Magic. You will not lose weight anyway in case of pregnancy, so you can rule it out. You have not mentioned about any possible history of smoking or alcoholic drinks. If this is excluded, then you may be having amebiasis associated with hyperacidity.
You should get your stool tested for worms and an ultrasound abdomen on consultation with your family physician. If it does not reveal anything, then you can opt for a gastroenterologist to go for endoscopic evaluation of your stomach and duodenum.
In the mean time, you may go for some form of antacid, and antiflatulent drugs, along with a proton pump inhibitor and a prokinetic drug. To this you can also add some kind of lactibacillus preparation on consultation with your doctor. Hope this helps you.

It sounds like stomach issue. All this is caused by high acid secretion which is found in gastritis, GERD or hiatus hernia. These disorders can cause such difficulties and you should do gastroscopy to evaluate this. Symptoms that are experienced in such conditions are pain and tightness in upper stomach, bloating, breathing difficulties, heartburn, feeling of lump and sore in throat, gurgling sound in throat, fatigue and loss of apetite.
Symptoms are aggravated after meal, long sitting, leaning forward,stress and anxiety. In the beginning this is treated by changing dietary habbits.
You should avoid alcohol,coffee,smoking,fats and fast food, carbonated drinks and eat more milk and milk products, fruit and vegetables,boiled food and natural beverages and teas. 1 hour after meal you should not sit or lay. Also lay with elevated upper body. If you are overweight you should do often exercise if overweight. Wish you good health.