Sounds as though you're flaring ...urgency is a for sure symptom. Are you going many times a day? If not, you're just in the early symptoms and should start rectal meds asap.
I have nausea often....and very often when flaring especiallly with rectal only inflammation.
Dicyclomine (Bentyl/Bentylol) which is an antispasmodic helps a lot.
I too prefer to eat when nauseated...foods with more salt actually.
Hope you consider the rectal meds.