I've been there, and it's the Crohn's that's making you weak. Since you're in a flare and everything's flying through your system, you're probably anemic and dehydrated, which would make you feel the way you do.
You do need your husband's help right now, so stay in bed and let him bring you food and water. If you feel like you're going to pass out, please call your doctor and go to the hospital, so you can get fluids through IV.
It's completely normal to be scared of surgery, but please know that you are going to be healthy and strong once that diseased colon is out of you. The ostomy is going to be a life saver for you. Because of it, you are going to have energy again and be healthy, just like you were before you ever got sick. I know, because I'm living proof of it.
Dx'd Crohn's in '99 at 28. Proctocolectomy and ileostomy in '06.
Disease-free, medicine-free, and very thankful to be healthy again :)