I Need help with 1999 Blazer 2wd tires shaking bad and ABS light on

It just started as I was in the process of getting ready to fix harmonic balance and crank shaft pulley as I think they are going bad with a ticking, squealing and wobbling problem..now the tires are shaking so bad I cant drive over 35 mph..I checked the tires and even replaced one I saw a bubble in and that wasn't it now I see fluid leaking from a shock in back and many other problems but what is causing the shaking problem?? Are they all related?