The sun  makes a cylic orbit above and below the rim of the Milkyway, kinda of like how a dolphin swims, it takes thousands of years to make one orbit from the north side of the gtalaxy to the south side below and above the equator or the spiral rim, which is not at the center.

The Milkyway has a massive black hole at it's center, this is the engine of the galaxy that holds everything together, yes it does suck in stars, gas, dust even light, It act like a giant drain but it's the reason our galaxy spins, and it also reseeds the galaxy by spitting out matter and energy in a super jet emitted from the black holes center that rains down matter and gasses back onto the milkyway that forms into nebulas that form new stars.

It would take hundreds of billions of years before earth got sucked into it, however the gravitational influence of this super massive black hole streaches arcross the whole galaxy from end to end and is something like a flattened disk at the equator of the Milky way.

When the Earth passes through this very strong gravitational field there could be a polar shift.

A polar shift can cause alot of things to happen on earth that would be bad including the slipping of the earths mantle.

Scientist are now seeing the poles slowly shifting, astronauts on the international space station had to go to a safe room recently because ther was a massive flucuation in the earth electromagnetisphere that weakened it, this protects the earth from the full force of the suns radiation.