Period Dizziness?

I have only just had strong period. Alot of lightheadedness and some dizziness. I didn't have this much of a flow up to that time my baby, could have a baby changed everything. I flow pretty stong for a daytime or two. I had my child over a year ago and I am on birth control.
Answers:

Bad knee backache?

If you have immense periods you may own meniraga. And you may need to purloin iron supplments because you are losing a lot of blood through your time. That's whats making you tired and dizzy and lightheaded

Best to always go and get your blood checked and ask you doctor about it, yes have a baby can net you body change greatly.

What is the "unusual Activity" which has stopped my email since Friday (96hours)?

Yep, sounds resembling you need to elevate your iron levels. Try consumption more foods rich in iron such as liver. Or, start taking an iron supplement. Check near your doctor to see what would be the best routine for you.

Im always cold?

You may want to consider a different birth control pill. The hormone level in the one you are taking may not be right for you. Talk to your doctor. I construe the headaches are from the hefty blood loss. I have have some trouble with that. If it is from blood loss try slow iron tablets. If its not from low iron for a while caffeine might help. It is supposed to relieve backache. You could also try a general anguish reliever. I take Aleve for my PMS symptoms it contains naproxen which is what doctors proscribe for PMS.