What Causes Pain Near Stomach While Coughing After Treated Basal Pneumonia?

Good day. I'm 19 years old, a college student. I've been sick for 3 weeks already. At first, I had a serve headache. I thought it was migraine. That night I had flu. For 3 days or 4 my flu is on and off. I came to see a doctor in our schedule. She prescribed some antibiotics and medication. And then the following days I started coughing and yellow greenish phlegm came out of me when I coughed. 2nd week the cough I came to see another doctor, she advised me to rest and prescribed some medications. So i stopped taking in my previous medications so I could follow the new prescription. Wednesday that week, I had myself undergo a medical examination for my practicum. So I undergo X-ray. 2 days after, the results were out and I was diagnosed I have right basal pneumonia. So i came to see the latter doctor again. Wednesday that week I weighted 47 kg, and then Sunday I weighted 45 kg. I lost 2 kg. So she advised me to be confined in the hospital and prescribed me another antibiotic and medicines, and also stresstabs -multivitamins. But I didn't get myself confined yet since the 3rd week was crucial for my studies and I have to go to my practicum. But every day after school and practicum, my body couldn't afford to stay up anymore so I just sleep as early as 8 or 9 in the evening then wake up at 7 or 8 in the morning. That was my routine for 3 days or 4. And then I was feeling better for two nights I was able to extend my day until 11pm or 12am. I have been more productive. Today I saw the doctor again she checked my weight. I'm back to 47 again. My blood pressure is 90/60 unlike last week i was low blood (i don't remember the exact measurement anymore). But my heartbeat, the doctor said, is still not normal, and now every time i cough, the right part near my stomach hurts. So I had myself Xray-ed again today, results will be out on Monday. She advised me to continue my antibiotics and other medications but she said it's okay if i don't get myself confined in the hospital. So what should i do now?