Shaky - you seriously, seriously, need to speak to your Union rep. What your boss has done is beyond comprehension.
Do not speak to her. She has set your condition back by her actions.
A simple email explaining that you are not fit enough to talk to her at present will suffice. State clearly that you will not be answering calls until you are in a better frame of mind.
Then, a short but to the point email/letter to her manager explaining what has happened and the impact of her lies on you RECOGNISED medical condition.
Then, speak to your Union rep and ask them to take the case over as you are not up to it.
You have been bullied, you are very vulnerable and you should never have been put in this position. There are laws in place to protect you under such circumstances. Your boss should not really be contacting you and putting pressure on you.
You have my complete sympathy, I have been in your position but ultimately my company were very supportive and followed procedure to the letter. I never once felt harrassed, bullied or under pressure to speak to them.
Please do not think she is allowed to do this to you. She needs to be reprimanded and appropriately trained as to how to deal with staff who are off sick and dealing with a challenging illness.
(((((hugs)))))
xx