featherbullet - I found some phone numbers that you may be able to call if you are feeling overwhelmed
http://www.suicidehotlines.com/canada.html You probably aren't as much of a burden on your family as you think you are - families are supposed to support one another, and I bet it's the depression talking. We all go through hard times - we are all human and sometimes we just need extra support. Don't feel guilty for that!
We all know how you feel. This is a pain in the butt, however we must keep trying to find an answer. I know you're going through a hard time right now, but just take each day at a time, as hard as that is. You're doing all the right things (seeing a neurologist, being on this forum, getting an MRI) and you never know what is around the corner.