The environment in the ISS is described as "micro-gravity", which means that gravitational effects are roughly of the order of a millionth of the gravitational field of the Earth. These effects include tidal effects (the higher side experiences a slightly weaker gravitational field than the lower side), centrifugal effects (the higher side is accelerating around the orbit slightly faster than the lower side and gravitational effects due to the local masses of the station components and occupants. Most of these effects are larger the further from the middle of the station.
The relative effect of spinning around its own axis during an orbit is a small part of that. You should be able to calculate the acceleration from ##r \omega^2## where ##r## is the distance from the axis of the rotation and ##\omega## is the angular velocity (##2 \pi## radians per ##93 * 60## seconds).