Wow I two am 1cm dilated it could be your blood pressure is high maybe drink some water or go to your nearest hospital
I'm no Dr but it sounds like Braxton hicks which is common around that time. It also sounds like you might be a little dehydrated and tried to get up too fast. The floaters (little spots you saw) are usually from moving too fast and dehydration. The hot flash,usually followed by chills can also be normal. Try putting a cold damp rag on the back of your neck for a few minutes, drink some cold water, and sit down quick. It helped me a lot and kept me from passing out numerous times