I have been in your position. I am 46 and worked for the same organisation for 12 years. I was off work with a work injury and developed severe depression. I got very phonephobic too, I'm a bit better now, but still have my days.
If you are off under an insurane scheme, definitely do not quit. Find out your options. And please don't let one dodgy doc put you off. I saw a couple of pshychologists before striking a fantastic one who has helped me immeasurably. The psychiatrist on the other hand would have done my head in if I was relying on him for advice, I only see him for medication advice as I have a low tolerance and terrible side effects to many meds.
I am under Workcover here in Australia, don't know what you have there in Canada, but there is plenty of options to explore if you are covered by insurance - that's what it's there for. I NEVER thought I would be a recipient of this, not my bag, but it got out of my control and I am very thankful the insurance was there, because 18 months without work and no income... I hate to think where I would be now.
My workplace was very toxic, and I am now in a new and very supportive environment. Yes I have lost all the security I had at my old workplace, including over 400 hours of accumulated sick leave, a much higher rate of pay, and much more opportunity to be promoted, but at the end of the day, inner peace is much more important, in my opinion.
They say life is a bowl of cherries........... we just have to learn how to spit out the pips!