Oh Sweetie,
There are many different anti-depressants out there. I don't understand why your doc didn't try different ones on you.
I, personally, have been on several before I found the right combination. I am on two different ones now and they make such a difference in my life.
Not to say, that once in awhile, I don't get so depressed that I close the curtains, lock the door and turn off the phone and lie in bed for days. Because, I still do that, but not near as often as I use to. I have days now where I actually feel happy again.
Before, I didn't even want to be around my own family.
If it's possible, you may want to try different anti-depressants again. It takes a few weeks before they really kick in but you will know within a month, whether they are going to work for you or not.
Also, if you can see a T, that would be wonderful. I use to see one but feel I don't need one now. They can be great though.
It's definitely not good that your heart is racing like that. It's not good for your health, either.
I am so sorry things are rough right now, but know that they will get better.
I wish this for you and hope your days will be bright with sunshine soon.
Hugs,
Boops