Yes, it's acid. Drink some milk, or eat eggs. They have a lower ph. Also, talk to your doctor or hospital about getting antacid pills. Until then, tums might help. And getting food in your stomach might help too. Milk, bread, things like that. My husband has to take an antacid everyday and avoid high acid foods like tomatoes, citrus, vinegar, some fruits just to have a normal day without vomiting. Even tomato sauce is bad.
The 1st thing is do not eat any more cucumbers because they cause your stomach acid to get aggravated. When you do eat you need to eat things that will keep your stomach acids from getting to aggravated like toast, pasta, crackers, apple sauce, bananas, & even yogurt. I have this same problem & I had to be care during my 1st couple of months of pregnancy when I had bad morning sickness. You can try cough drops or even drink some hot tea with honey to help with your throat. I hope you feel better soon.