Thank you for the responses

Sorry I'm so late getting back, life is always so hectic.
My boss was only in for a short time the other day. We haven't talked much, but she did express to me that she was disappointed I couldn't tell her what was so upsetting on Monday that I had to use a sick day. I just told her that there is a lot going on right now and it is too personal to talk about. Still no word on vacation or promotion. My anxiety's gone down a bit as I've been focusing on getting our visual displays up to snuff. That is my favourite part of this job, setting up all the displays and selecting our new stock, its a very nice distraction from everything else going on there.
@The Skeezyks: Thank you. Yes, it is a bit of a pickle. I have been humming and hawing over a job switch (a friend a few stores over told me he could probably get me a shoe-in at their shop) but it's like... I want to leave with that manager position on my resume. I feel like its such a waste to get all the training and experience and never get the job title

But then I'm waiting forever I suppose! I like work and it generally keeps me out of trouble but taking medical time off is starting to look like a good option for me. I'm just worried about the income loss, especially with Christmas coming up. And the employment gap.
@lostinpdx: Thank you for the information!

I'm sorry to hear you have had the experience of stress induced psychosis too. It really is a spiral down. I would not wish this on anyone. I'm in Ontario, Canada specifically as laws differ by province. I know we have labour laws and employment standards and I've been taking pictures of the changed schedules in case I ever need to cover my butt or decide to go to the Board. My therapist has suggested to me that I take disability and go down to part time... I know a woman who works in the store beside us does this as she has chronic health issues but wants to work too. I used to reject the idea but it sounds like it might be what I need. Plus I could do some volunteering at the shelter house with the new free time. That is something I really want to do but my crazy schedule has made that impossible. Again, there's the sticky issue of potential income loss...
I think I am going to talk with my therapist next session and explore the part-time/disability option. Maybe see if there are offering any vocational training courses too. I agree, my health should be my #1.
Thank you for the insight everyone it helps so much