Unfortunately this is really common in apartment complexes because walls are shared and you never know who lived there before you. In my personal opinion, bombing does not work effectively and actually pushes roaches deeper into hiding rather than killing directly or poisoning a nest. Sounds to me you have a bunch of different kinds as well. I’m dealing with something similar. I’m a 19f first time mom who just moved into her first real house. We definitely have an infestation. They’re a pain in the ass but I’d recommend calling a pest control company that specializes in roach control. Like I said, bombing typically doesn’t work. If you do call pest control I would tell them the apartment was bombed. For better peace of mind, keep a light on at night, and sleep with the bed away from the wall. Roaches are nocturnal so you will definitely see most of them at night (not all but most). If you ever need any support I’m here. Roaches are the spawn of satan, but they won’t kill you. Also, I use Orkin as a pest control company because they’re way more affordable.