Hope the recovery is swift and fruitful!
Regarding when to seed, grass is best seeded in the fall/winter in most places. For a pasture, I'd sure not disk it. At most, scratch it up a bit and broadcast the seed. A cultipacker wouldn't hurt, but not needed. Freeze/thaw/weather should get the seed to the soil surface. If you have cheap/easy access to a drill, I'd use it, but I'd not worry about it. If plenty perennial grass species, I'd not be afraid to use some wheat/cereal rye/etc as a cover crop, especially if you'll need to use it sooner rather than later.
