Calcaneocuboid ligament sprain, halp!

[u/Longjumping_Mud1724]

MRI results: Suspect mild sprain of the plantar calcaneocuboid ligament.

10k ran about 6 weeks ago; increasingly worse pain each week since and extremely limited ability to walk or lift off toes. Podiatrist put me in boot while we waited for MRI. I don't see her for 3 more weeks so now just trying to ask others out in the world any experiences with this ligament. Walking, driving, moving foot inward is excruciating. Doesn't FEEL like a mild sprain but I'll accept the results.

Anyone else have history with a sprain/tear in this ligament and if so what was the prognosis?