It's great the way this has taken off!
Something to consider, especially given how difficult it is for people to send in photos: the video does not have to mimic every line in the song. "Two-ton weights that hold me down" is a metaphor for the way the disease feels ... it's not a metaphor for two-ton weights.
Pairing those lyrics with something more subtle, like a photo of someone sitting on a bed, head hanging down, might actually be more effective -- and way easier to photograph!
This is already so hard for a lot of you. There's no need to make it harder on yourselves by playing charades with the lyrics.
That said, I second Samuel's idea of wheelchairs, gravestones, etc. It would also be good to follow up a picture of an obviously sick person with a pic of the same person before ME hit, smiling and doing some physical activity. Laurel used this technique to great effect in her CFSAC video, and I'm guessing she wouldn't mind this video borrowing the idea.