It would take at least 3-5 days to notice any difference from a PPI. You need to see your medical provider for an H. pylori test to rule out an ulcer. That requires not just a PPI but antibiotics as well.
If it is gastric reflux (far more common than ulcers), there are some things you can do to help the symptoms. First of all is not to eat within 3 hours of going to bed. You should also raise the head of the bed about 6 inches higher than the foot. Most people do this by putting the head end of the bed on cinderblocks, or you can buy bed risers at Bed, Bath, and Beyond.
Avoiding foods that typically trigger symptoms can help. This includes foods that are spicy, greasy, fried, carbonated, citrus, chocolate, peppermint, gas-producing foods (onions, garlic, broccoli, cabbage, beans, etc.), alcohol of all kinds, and also avoiding smoking. Try to eat smaller meals every 3 hours or so rather than 3 large meals per day, and nothing for 3 hours before going to bed.
You should try to maintain your normal exercise routine (30-60 minutes per day) and try to relieve stress by whatever method works for you. Some people only require exercise, but there is also yoga, meditation, music, reading, etc.
Please let me know what other questions you have about this.