Can herpes eventually kill you?

Yes, it can, but very very rarely.

Herpes is a very common infection, affecting about 60–70% of the world population under age 50 (source: WHO).

Most of the time, Herpes is just an annoyance, causing sores to appear on your mouth or genitals.

However, in rare cases, herpes can be life-threatening, if it leads to complications in your nervous system e.g. encephalitis or meningitis. This article explains further: Neurological Complications of Herpes Simplex Virus Type 2 Infection

These neurological complications are very nasty, and even if you are treated and you survive, your brain is likely to sustain permanent damage.

Some figures:
In USA, between 1999 and 2010, a total of 223 reproductive-aged women died of herpes-related conditions.

Source:
Mortality From Sexually Transmitted Diseases in Reproductive-Aged Women: United States, 1999–2010

What are the chances of getting HIV from a needle stick injury?

Firstly, are you sure the needle was used by a patient who has HIV?

Assuming yes:

Actually, contrary to the answers I see here so far, the possibility is not zero – it happened many times before. A nurse in the United States in the 1980s got infected by HIV when she accidentally pricked herself on a needle.

See the full story below.

Nurse who contracted HIV with jab sheds anonymity

But, the chance of this happening is very low.

According to the article, as of 2011, there were only 13 such documented cases in the USA.

Can I catch STD by nipple sucking of a possibly infected person without lactation or open wounds?

Consider the following major STDs: HIV, chlamydia, syphilis, gonorrhea, Hepatitis B & C and Genital Herpes.

I’ve not heard of anyone getting infected by chlamydia, syphilis, gonorrhea, hepatitis or genital herpes via mouth contact with breasts.

As for HIV, the virus can be transmitted from mother to child via breastfeeding, via the breastmilk, but since there was no lactation in your case, you should be safe. Also, most cases of transmission via breastmilk occurs for mother to child. For an adult like you, it will be more difficult to get infected via breastmilk, even if she was lactating. This is just my guess.

What HIV blood test is the most accurate after 3 months from exposure? 3th generation or 4th generation?

After 3 months, there is essentially no difference in accuracy between a 3rd and 4th generation HIV test.

The only advantage of a 4th gen HIV test over a 3rd gen HIV test is that the 4th gen HIV test can detect HIV antigens, which only appear in the first few weeks of HIV infection, whereas the 3rd gen HIV test cannot detect the antigens.

Usually, 3rd gen HIV tests are cheaper.