Did I damage my wheel bearing(s)?, or WTH is going on??? Options

[conus00]

Couple days ago I came very close to having accident. Some jerk pulled a U-turn right in front of me and I ended up hammering my brakes so hard that I locked all four wheels and after maybe 30ft of skidding I stopped couple feet from that a$$hole. I was literally in a cloud of smoke from my tires so thick that I couldn't see anything behind me. Normally, I assume, that wheel/suspension components should be able to handle that amount of force with stock brake system but I have recently upgraded fronts to Willwood big brake kit and rear to GT disks. I haven't changed hubs or anything. Also, bear in mind, that majority of the components (not counting engine) are, most likely, original and hitting 230,000 miles mark.
That being said after this close call my car developed weird vibrations in front.
To best describe it:
It is not noticeable up until approx 65mph. After I hit that speed the cars has sort of bumpy feeling (like going over a whole bunch of tiny speed bumps). When I get close to 80mph the feeling of vibrations changes to, sort of almost a buzz.
Also I noticed that at the high speeds on highway (around 70-80mph) while turning into long curve (or changing lanes) the vibrations intensify. It's really hard to describe it.

I'm curious what might be causing this and how dangerous it is to drive in such condition. Also I'd like to know if it is in any way related to my near accident experience.

Thanks!

[opie_7afe]

i agree with flatspots my dad had a 95 grand prix gtp he was trying to be cool and locked on ebrake and floored it(was an auto) well next time i drove it felt like i was riding on square tires nearly was so damn bumpy! so yeah id throw some other tires on there man and should be good to go.....sometimes you can see the flatspot if you turn the wheel slowly with it jacked up....good luck and be glad you didnt wreck!