Hello, I have gone through your query and understood the concern. If the baby is vomiting after every feed, two things must be observed- if the baby is vomiting because of excess air in the stomach due to ineffective belching or if there is any anatomical or physiological cause like pyloric stenosis or indigestion. Pain in the abdomen can be seen soon after delivery as the uterus undergoes involution. Pain in the back can be postural and can also be attributed to the lax joints and ligaments and loss of muscle tone. Simple exercises and good posture with adequate rest are the remedy. If you cannot meet your doctor frequently, at least make sure that you can be in contact to get suggestions. Hope this helps.