Hey lampost, sorry to hear about your problem, I too had a few issues with my circuit breaker, fortunately I resolved them.

So in your case, imo I wouldn't call an electrician because they'll charge you an arm and a leg, unless you know someone that owes you a favor, or will do one for you, or do it for cheap. However it's really not all that difficult to fix, mainly just making sure the power is off when dealing with wires (very important; ive never experienced but I wouldn't ever want to), and then just making sure you put wires back in the same spots they were in. and there's only two wires to worry about, a white wire, and a colored wire.
Not hard at all, of course assuming you still have a decent short term memory to remember where the wires go:jointsmile:

I've included a step by step process on how to replace a circuit breaker courtesy of ehow.com (not that I couldn't explain, but theirs might be a little more reader friendly So enjoy and let us know if it works!

It starts at step two, step one is using a radio, but you don't really need to use that, you'll know if your microwave works.
#Step 2

Find your panel box. It's usually in the basement or utility room.
#Step 3

Turn off the main power, if possible. Most panel boxes have a main on/off switch.
#Step 4

Press the tripped breaker toward "off" to reset it, then to "on." If it trips immediately, you either have a bad breaker or a short somewhere in the circuit.
Replace the Circuit Breaker
#
Step 1

Purchase a new circuit breaker from a hardware store.
#
Step 2

Take the panel cover off the panel box by unscrewing the face plate.
#
Step 3

Notice the two wires feeding into the side of the breaker. Remember which one is in which position.
#
Step 4

Loosen the screw holding the white wire first just enough to get the wire out.
#
Step 5

Put a wire nut on the end of the white wire and bend it out of the way.
#
Step 6

Loosen the other screw and do the same thing with the colored wire.
#
Step 7

Pull the old circuit breaker out and snap a new one into place.
#
Step 8

Replace the wires in the same positions as they were on the old breaker - colored one first, white one second.
#
Step 9

Tighten the screws holding the wires.
#
Step 10

Replace the face plate.
#
Step 11

Turn the power to the panel on, if necessary.
#
Step 12

Turn the breaker on. You should hear your radio. If it trips, call an electrician since you most likely have a potentially dangerous short circuit.