Can H1B Amendment be filed within 2 weeks of joining the new work location?

Contact the company's US immigration attorney for strategy clarification.

What do I do in this circumstances, go for reinstatement?

Contact a US immigration attorney for specific review.

Yes, you can apply for a new EAD as part of the adjustment. Contact a US immigration attorney for assistance.

How long can I stay in the country in this situation?

There is a 60 day grace period. Contact the new company's US immigration attorney about future TN entry issues.

Travel history to USA

6 months and 1 day is an overstay. Contact a US immigration attorney for review.

Can a senator of Congress-person help by passing the private bill for green card for an individual with a dui?

You do not realistically qualify for a private bill and a DUI does not prevent issuance of a green card. Contact a US immigration attorney for...

You may but you should review with a US immigration attorney prior to filing.

Will it show immigrant intent if I tell the VO my American citizen sister supported me partially during my trip?

There can be issues with the VO, but probably not for immigrant intent since your sister didn't file for you. Contact a US immigration attorney...

Do I have to answer question 19 b If I'm category (c) (9) on form I-765?

Generally no - you are not applying under those categories. Contact a US immigration attorney for review before filing.

Is there any problem if i applied for the 2nd time?

USCIS will review the previous petition, but if your marriage and income are valid, you should be approved. Contact a US immigration attorney for...