Can you get fired for having a mental breakdown?

I have worked for a job for the last 3yrs and just last week I had a mental breakdown at home...I called my boss left a message. I called my dr of 4 years to see him. I have been in a marriage that was ending after 7yrs....i was given a heads up by my ex that I would be kicked out of my home. Keep in mind i have a child from a previous marriage-so we were freaking out I didn't have any extra money...thank god I had a job...but my job was not very sympathetic. I was trying to be optimistic...we found a home and things seemed to be going in a good direction until we hit the money wall $1500 so we can keep this house no help from the ex from 7yrs of marriage-what a catch right?! Or any type of istance because i supposedly make to much money-i wish. I had to move my child from a different school and hey we were managing....I was actually proud of myself...I hadn't given myself time to let all the bad things set in...keeping busy or at least trying to. Then bam 2 weeks ago I felt like i was dying...i could not get out of bed...cried all day...I was literally sick-i did use my sick leave that i had...but its frowned at this job. I haven't been like this since 2 months ago when my ex told me to get out. That lasted maybe a weekened of ing and trying to get it together and I went to work & no I was not ok but i sucked it up. This week I totaly broke...I dont know what happened...we are in limbo as far as divorce....we filed but it hasn't been finalized. I do miss him as stupid as that sounds...but I had a meltdown and now I have to deal with consequences of work for not understanding all the stress I have been through personally and at work....the last co worker quit because of my boss, What I am trying to understand is that I called & left a message to my boss....sobbing letting her know I was seeing my dr that day. I got a phone call at home from my boss rudely asking if im coming to work....i told her i left her a message....she belittled me saying i just got a raise and I need to be here because she needs me and she is leaving at noon because she has a sinus infection that she's been on medication for the last 2 days..and asked if i'd been drinking....nevermind...i dont want to know and i dont care. Then she had her boss call me asking me to get it together and come in until 3 then i can go to my own dr appt. My dr faxed my employer that they need to excuse me from work so now I will be going in tomorrow scared as hell...the last girl quit. I have had to deal with my boss and her moods...trust me I have wanted to cry many times & i did suck it up....just trying to be brave....and not get walked all over...I either go from one extreme to the next....so who knows what will happen but one thing i know i will not apologize for my break down...or be ashamed.