I'm on F1 visa, am i eligible to switch to J1 visa?

Your best source of information would be your potential J-1 sponsor. There are various J-1 visas so it is best to consult an attorney.

My STEM EAD was shipped and delivered, but I never received it. What options do I have to handle this?

I agree with my colleague. Your best option is to seek a replacement. Consult an attorney.

How my citizen wife can fix my legal situation?

I agree with my colleagues. Lots of issues here, but does not look like you can adjust in the US. Consult an immigration attorney.

Can I still work with my J1 visa after I fill the application for my green card?

You will continue to be in J1 status until a decision is made on your green card application. It is best to consult an attorney.

My H1B is going to expire by June 2014(completing 6years) and My Husband has H1B visa. So I am planning to stay in USA In H4

I agree with my colleagues. Applying for an H4 will not allow you to start a new h1-b for 6 years. It is best to consult an immigration attorney.

Cases in Islamabad under administrative processing can take a very long time. It is best to consult an immigration attorney.

Should I attend my boyfriend's immigration hearing and/or write a letter to the immigration judge on his behalf?

I agree with my colleague. You should talk to his immigration attorney. He will need a lot of assistance to help him.

How long will it take to get a work permit and green card after I filed for an adjustment of status?

If you are aging out, you probably will not have time for either a work permit or green card as you have to first do fingerprints. It is best to...

I 751 abuse waiver

Yes potential fraud will delay a decision on your case. As long as your I-751 was properly filed you should obtain a receipt notice that will...

Can i start a business?

As long as you have your work authorization you should be okay. It is best to consult an attorney.