Octalink is the Shimano spline pattern. I checked FSA website. They have about 15 different BB's with balls, sealed races etc depending on the model. Yours might even be fixable if it is a sealed bearing model!!

I'd attend to the sticking headset asap. BB should be ok for a week or two if you can put up with the click and there are no cracks in the cranks (better check that) or play in the BB. Is this where I put in a legal disclaimer?