Sounds like it "could" be a partial blockage. Stick to the fluids... even hot tea can help. Heating pad is a good idea. Massage the left area where the pain is and keep moving about. Watch taking any additional imodium or pain killers till this passes. If you throw up and have no output, I mean, NO output, go to the ER. Especiallly if you are throwing up. Keep walking, stand up, sit down, lay down, get up again. Sometimes movement will help things along --- even if it really hurts. Do you have a fever.... don't take it after drinking hot or cold liquids.. wait about 15 minutes after your last drink.
Let us know how you are doing.
Diagnosed with CD in 1979, many resections and meds
Perm Ileostomy July 1984 at Cleveland Clinic
Disease free since surgery