Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. Good to know that you are taking fiber in your diet, you need it. Drink plenty of water, re-hydrate yourself with ORS and juice or soups. You need to come out of chronic constipation first for it will result in bloating & gas formation that will lead to back. Take Pantoprazole once daily for a week while continuing to take fiber. You can take Dulcolax with milk before sleep. For abdominal pain you should take Spasmoproxyvon, one stat for pain. For Backache you can also see an orthopedic surgeon. However, some diseases like irritable bowel syndrome, hypothroidism or diabetes can cause chronic constipation.Visit ER & get the General health check up done, get screening tests done to rule out the above. Get diagnosed & treated before the symptoms worsen. Hope I have answered your query. Take care. Regards, Dr Nupur K