I agree- you don't know exactly whats going on, so just to be safe I think a doctor should monitor you. I totally agree with Dawn- best thing for your kids is for you to be healthy and safe. I'm so sorry your neighbor is being a brat (can think of another word beginning with B i'd like to call her) but I'm SURE any other person you can think of will be happy to watch the kids.
Can you call for an ambulance if not???
If you cant find another option, best to take kids with you. Hopefully soon someone would be able to come get them.
I hope everythings ok!!!!!
p.s. and when you get better: give that neighbor a good piece of your mind