Will this be a big problem? What are my options?

I agree with my colleagues contact an immigration attorney for review and recommendation for proceeding.

Will I loose my OPT if I utilize CPT for more than a year continuously?

Discuss with your school's DSO or FSA.

Does the US require a 6 month validity on a foreign passport to travel to the US?

Passports from many countries by agreement are automatically extended for six months. Your principle issue will likely being permitted to board the...

Can I file a waiver and advisory opinion at the same time?

Yes filing both at same time is a good strategy.

If timely filed yes. Speak with your employer's immigration attorney.

How will I get affected with the new bill on H1-B immigration?

Many bills are introduced very few become law. This is nothing to pay attention to at this time.

How can my husband go back to the US legally and fast?

Assuming you are a US citizen, you may petition for your spouse. Your spouse likely has a 10 year bar for unlawful presence and if he had entered...

It becomes an issue when you start to work, in violation of OPT authorization.

Do we have to have K1 to get married here in the US?

A K1 is not required however if entering the US to wed as a b visitor my pose an issue at the border. There may be some delay with K as CIS reviews...

Does the USCIS decides my EB category? If the response of RFE is not accepted by USCIS, do I have to redo the PERM or can I s

No CIS does not decide which classification. The petitioner chooses and CIS decides if your application qualifies. Yours may need to be refile....