I am not familiar with colonic inertia but from what you describe, having a bag will be heaven compared to the hell you go through on a daily basis. It's really not that bad.
I'm sorry you're struggling so much right now. I hope things start looking up for you soon!
33 years old, dx with Crohn's in 1998. Currently on :
Clofazimine 100mg daily,
Rifampin 600mg daily, and Clarithromycin 2 tabs daily
and Cipralex 10mg/day for anxiety.
Hydroxyzine, percocet, Ativan as needed.
5g pharmaceutical grade Omega 3's, 1000IU's Vitamin D3 daily
2 Perianal fistulas, and 1 more suspected. Crohn's only at end of colon, cecum. Remi, Asacol, Salofalk, Imuran, Humira did nada. Built immunity to long-term Cipro use, which also induced panic attacks.