I think you can get the interim EAD from the local INS. To my knowledge, you need:
1. Copy of your current valid EAD.
2. Copy of your EAD Receipt notice.
3. Latest photographs, like you did before for EAD.
4. To be safe, take your current Employment Letter and paystubs and your passport.
5. Copy of your latest I-94 Copy from your passport.
6. Fees, check with somebody about this, I don't know if you have to pay the fees for Interim EAD.
Maybe others will rspond to my list given above.