Depo injection here we go again

Stephanie
Ok so I've recently started having the depo injection again and not going to lie I'm a bit scared. I had my first injection on the 16th of Feb, so not long however I've been on my periods for the past 4 weeks none stop!
 I debated going back on the injection for a long time cos I was on it like 4 years ago and had to stop cos I missed my period during the first month but then I was on for 8 months constantly ( I had 3 injections so the equivalent of 9 months). I'm really scared it'll happen again this time round!
 Has anyone been through the same thing? If so have you got any advice?