If it's been diagnosed as Crohn's disease, then you will be asked to take some antiinflammatory drugs to bring down the inflammation . It's called maintainance drugs.
If there is infection now you will need antibiotics as well
For pain and cramps you can take Tab Dicyclomine 10 mg 3 times a day for a week.
Next Steps
Take the medicine and see a Gastroenterologist.
you might need a endoscopy ( colonoscopy) to see if any strictures have developed.
Check your Haemoglobin.
Health Tips
Take soft diet which can be easily digested.
Plenty of fluids- water and juices.
Take iron rich food- Dates and green leafy vegetables. Your weakness could be because of anaemia.