Sciatica Attacks!

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Hiya ladies - I'm 28 weeks and 25lb from my starting weight. I was doing ok with house work and dog walking as my main sources of exercise until 3 weeks ago when the sciatica literally attacked. I couldn't walk more than a few steps without resting, waiting for the stabbing pain to abate, before I started again. This was just walking from the bedroom to the kitchen.

After a few visits with an amazing physical therapist I am able to walk (almost) normally but I'm petrified of resuming exercise again. Has anyone gone through this or have any advice?