Well, it firstly depends on what you mean by force. I presume that you mean gravitational tidal forces. They are very large past the event horizon of a black hole, but I cannot provide you with exact numbers.
Again, what do you mean here by "g-force"? It is true that any accelerating observer will have a sort of event horizon, however it is not the same as an event horizon around a black hole. The event horizon that the accelerating observer experiences is only a one way event horizon-- there exists regions of spacetime from which causal rays cannot reach the observer, but not vice-versa.