Retribution (1987, Guy Magar)
Always remembered the VHS sleeve. Never took it out though .... probably for the best as I think twould have been cut back in the day ahem.
A nebbish tries to take the easy way out but falls foul of .... hmmm, how to word this correctly without spoilers ....
something 
and so finds himself on the rocky road to recovery, aided by a concerned medic and a genuine tart with a heart. An odd beast. Takes certain tropes and just runs with them. Some wild kills and an overarching "feel" of something not quite right pulled this one out of standard schlock fare imho. Plus Rand Peltzer turns up as a cop!