I don't know what to do anymore, I haven't been able to go to the bath…

I don't know what to do anymore, I haven't been able to go to the bathroom for days, I ate and had apples and prunes, with no results, Microlax is not helping anymore ?. And I noticed that when I go to the toilet, there's a strong urge to have a big one, but in the end, nothing... Nothing at all, I don't even know how to fight this. My back hurts from trying to empty myself, it's awful ?