I'm so sorry to hear about your situation. I too have been in an abusive relationship that I managed to escape with my 1 year old.
You have already taken the most important step which is to ask for help. You are a good Mom.
I will PM you my email address. Please feel free to email me any time. I know how scarred and alone you must feel. Especially considering that you are trying to protect you little one.
The best thing you can do for yourself and your son is get out safely. Here is the number for Sherriff King Home. Everyone there is so very helpfull. They can help you and your son in everyway. I highly recommend you call them for advice.
You can also try HomeFront. I haven't used them myself but I have heard great things about them.
"...An internationally recognized, research validated, leading edge, coordinated community-justice response to domestic violence in Calgary. HomeFront is a collective of systems and services sharing a common vision and goal to reduce domestic violence in Calgary."
If you need to talk, get help in what to do or where to start, give Home Front a call.
www.homefrontcalgary.com