As part of our MA Art and Science course, Heather Barnett gave us a fascinating full day workshop in which she introduced us to physarum polycephalum, and talked about her interest and her work with slime moulds. During the day we created a class stop frame animation with a specimen she brought - I fear we overwhelmed it with our 'interventions', but we learned a lot in the process.
Oh dear, I'm sorry to hear that! You could try giving it lots of moisture, a nearby oat and keep it in the dark. It can be pretty resilient, it might come back to life. If not, to reassure you, it has no central nervous system so it didn't die in pain! The pictures from the session are great, thanks for posting.
The collective experiment continues to navigate the assault course set for it by the group. I'll post some photos.