LTSpice Simulation Showing Inaccurate Results and Excessive Current
Suffixes in LTspice are not case sensitive, so your switch's off resistance Roff=1M is actually 1 milliohm not 1 Megohm. Change it to Roff=1Meg and it will work.

Without a switch you get several thousand Amps because the initial conditions are calculated at DC and inductors are considered to be short circuits. The inductor in your circuit has close to 150V across it, so the initial DC current is very large.