You'll probably get more help on this one, but my general advice is to trust the rehab the same way you trust your training. Don't give up and don't push too hard too soon. Expect this to take a while, as many have reported. Avoid surgery, since it is a crap shoot for active persons like yourself. Once your brain tunes in to a particular pain source, it can become hypersensitive to pain in the area. Taking your rehab a day at a time is part of the process of relearning how to use the injured area, and confidence building.

Beyond that, there are probably more exercises down the line that can be tweaked to strengthen the tissues around your phalangeal joint in preparation for a return to running. Plantarflexion of the toes may be an example, but this down time is also an opportunity to examine the biomechanics of your foot for any condition that might predispose you to sesamoid injury. Here's an interesting and informative article on the subject, and another.