gee you need some support at the moment. Is talking to your DH not an option? Do you think that would make things worse.
I know you arent ttc#3 again so is that the reason your so upset, apart from the fact that your hormones are running rampart.

Kerrie i think you have already answered your own questions about your body though. And the fact that you had spotting a few weeks ago. It all sounds like you are pg again. Can your sister look after the kids while you go get a blood test. Even though its a huge pain in the rear to do you will have peace of mind once its done and you have the results. If it is indeed postive then you and DH can start dealing with it.
I dont know what else to say to help you out. Sounds to me like you need a break to me.

Chin up.