Love is a very, very powerful emotion and you can't expect it to just switch itself off immediately. You will need time to heal. You've had to make a lot of big decisions very quickly which is very difficult to cope with. Moving house just in itself, even in the best of situations, is considered one of the biggest causes of stress there are. And the circumstances you're having to do that in makes it even worse.
The only advice I can give is what others are saying. If at all possible take a time out from making any more big decisions. You're saying you're considering going back to your ex, or are at least conflicted about leaving him. Perhaps just resolve right now that you will make the decision about whether ending the relationship is permanent or not say 3 months from now. Or 6 months, or whatever. Let the dust settle. This will also give you time to reflect on what has happened, away from the current pressure cooker atmosphere. Given you have a young child, it's very important that you make the right decision as it will impact on his future as well as yours. Use all the support you can get, here, from friends and family, perhaps consider counselling if that's an option.
I understand how overwhelming and traumatic everything must be for you right now, but I'm sure with time it will get better and you will make the right decision for both you and your boy.