It is dangerous to think about the Schrodinger equation and other quantum mechanical ideas from simple Newtonian physics. It is more natural to consider classical Hamiltonian mechanics. For example, in Hamiltonian mechanics, we have the Poisson bracket, which one might think as the classical analog of the quantum mechanical commutator:
$$\{A,\,B\} = \sum_i \left(\frac{\partial A}{\partial q_i}\frac{\partial B}{\partial p_i}-\frac{\partial B}{\partial q_i}\frac{\partial A}{\partial p_i} \right)$$
where $A$ and $B$ are some physical quantities. From the above, we have the interesting property that the Poisson bracket of a time-independent quantity $A$ with the Hamiltonian is the negative of the total time derivative:
\begin{align}
\{H,\,A\}=-\frac{dA}{dt}
\end{align}
Now, let's go to the quantum mechanical world, and change our Poisson brackets to true-blue quantum commutators:
$$\{A,\,B\}\rightarrow \frac{1}{i\hbar}[A,\,B] $$
Plugging this into our equation for the derivative above, taking $A$ and $H$ to be average values with respect to some wave function $|\psi\rangle$, and taking $A$ to unity, we obtain the Schrodinger's equation:
$$i\hbar \frac{d}{dt}|\psi\rangle = H|\psi\rangle$$
As ZeroTheHero said, Schrodinger's equation is not limited to simple Hamiltonians of the form $p^2/2m+V$--it is much more general than that, and to understand it as the limit of some classical theory, we have to dive into Hamiltonian mechanics as opposed to Newtonian.