2001 Mazda Millenia BRAKES NOT WORKING!

Brakes problem
2001 Mazda Millenia 140000 miles

Hi,
My brakes were working just fine 24 hours ago. Then I parked my car on an incline and put on my emergency brake. After getting back into the car, putting my emergency brake down, and pulling away, I was barely able to brake the car. Now my car will stop only if I start braking way in advance and I'm going at a slow speed. The brakes are practically not working and it is not safe to drive!

Some observations:
1) The emergency brake light is still lit up on the dashboard.
2)When I pump the foot brake there is no resistance (something to do with brake fluid?), And pumping the brakes repeatedly does nothing to rebuild resistance.
3) Every time I push the foot brake down and then release it there is a single click directly beneath the emergency break lever.

Also, I had my oil changed within the past month and they checked/topped off all my fluids, so I'm not sure why the brake fluid would be low.

Any help would be greatly appreciated! I don't have the money for major work on my car, and since I just paid a hefty bill to replace a blown fuse, I would feel very relieved if this was a minor problem with an inexpensive solution!

Thank you in advance,
bailey32