Ladies please help.

I'm 36 weeks and I have SEVER SPD (pelvic pain) to the point I can't even walk now. I'm constantly in tears I'm bed bound all day when i have two children, I can't roll over in bed, I can't walk up the stares, I can't even wipe after I take a piss. And it's getting so bad that the being bed bound and the unable to walk and the being dependent on my 4 year old to get me
Things I need that I'm finding myself getting totally depressed. 
I have an appointment tomorrow and I'm going to tell my midwife all of this, but I'm scared she's going to act like its nothing. What could she do? I can't do this anymore. I'm in so much pain I'm crying typing this.