I agree with nickie, you should test. Although you do have symptoms of pregnancy, they are also NOT symptoms. Many things can cause the symptoms you have and it may be as simple as you having acid reflux and needing medication. If you take a test and it comes up negative, call your doctor again and explain your issues and try to get seen soon. My sister was having problems like you are and she has gastritis, that's not to say you do as well, but it is also a possibility. She had to change her diet and take medication.
It all depends on when your last period was and when all of these symptoms started for you. April 1st was the beginning of the month and a pregnant body can change a lot in 3 weeks. I think you need to take a home pregnancy test and see what the results are. Acid reflux can be caused by many different factors and acid reflux can definitely cause nausea and vomiting.