First you need to check the circuit you are working on. What's the rating for this? (20 amp, 30 amp, etc)
Next, you need to find out just how many more outlets your picking up "Down-line" from the GFCI.
You may have to much load for this circuit. This sounds like the case.
You'd be better off splitting this so the bathroom is on it's own circuit in the circuit breaker panel.
The other rooms would end up on their own breaker as well.
Don't just incres the size of the breaker or you may end up with a fire.
Remeber, your working with old wiring. Do it right.
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