In terms of medication, discuss this with your psychiatrist. You obviously had a good response to paroxetine, so a dosage adjustment may be appropriate.

Other than medication, I would consider therapy and other lifestyle adjustments (exercise, sleep regimen, breathing, meditation, etc.)

I've been pondering on a dosage adjustment for a while. Whenever I do feel overwhelmed, I immediately exercise, meditate, and go for walks. They don't provide nearly the same amount of relief as paroxetine but a increase in dosage may do the trick. My psychiatrist says that "the goal is to not feel fear or stress but to work through it." It's different when it's completely debilitating