Well, if you took a moment to calm down, take a deep breath, and stop crapping your pants long enough to do a search, you could find a few answers. To answer your question, yes, there have been cases where healthcare workers most likely were infected by HIV after getting stuck by a dirty needle. It's not that common anymore, but there are reports where it has happened.
Secondly, you don't get AIDS from patients, you get HIV.
Finally, needlesticks are less of a big deal, in terms of HIV, because there's post exposure prophylaxis, the rate of transmission isn't necessarily all that high on its own, etc. Hepatitis B is also not a big deal, since you should be vaccinated against that. The REALLY scary one is Hepatitis C, which does have a high rate of transmission, does not have a vaccine, does not have any form of post-exposure prophylaxis, and has a good chance of becoming chronic and possibly evolving into liver cancer. Premeds always get in a tizzy about HIV, but that's not the scariest possibility.
Just as an FYI, if any of you are ever exposed to Hep C via a needle stick or other exposure, there is some hope. Although it's not really prophylaxis, there is treatment available. In a nutshell it works like this.
If you are exposed to Hep C, you are tested at that time to determine if you already have Hep C. If not, than you are tested over a period of 6 months or so.
If you convert, then you are treated for Hep C right away using the drug combo Pegasys and Copegas. From what I have been told by a doc who specializes in Hepatitis and liver disease, the cure rate is pretty close to 100% when treated in this manner.
Even then, everyone please be careful. Don't rush during invasive procedures, or when suturing and for god sakes, NEVER leave needles in the patient's bed!! I can't tell you how many people have been stuck because people don't clean up their sharps or they stick the needles in the mattress and forget about them.