I agree. go to the ER, or see a doctor ASAP. When you write "am home alone", does that mean you are young? A child perhaps? Or just that you have no one to turn to for help getting to a doctors office? It's hard to tell from what you wrote just what your circumstances are. Drinking plenty of fluids is important anytime, but one rule of thumb I use personally is that nothing goes in until something comes out when I am in the midst of a bout of constipation, or think I may be impacted or blocked up there.
When that happens, I have used very mild stool softeners to correct the situation.. But that is my case, and everyone is different... and I'm in no position to offer you medical advice.. That is what doctors are for. Anyway, get to a doctor, and let us know how you make out..