As per the USCIS instructions for form I-864, the line for "Total Income" on IRS Forms 1040 and 1040A will be considered when determining income....

What do I do next?

There aren't too many options for you at this point, but to wait. However, you can try calling the USCIS Contact Center customer service number...

Can I travel to Africa with my 18 month extension that is still valid ?

Yes, you may travel internationally as far as U.S. immigration laws are concerned. However, (although it won't be an issue on most airlines) you...

Yes. You may resubmit I-864 with most current tax return and proof of current income. USCIS looks at current income from your recent paystubs. ...

Can my spouse work from other country while on H4? He will not be in US and will visit me occasionally (by taking leaves)?

Your Indian citizen spouse's employment in India with an Indian employer does not infringe U.S. immigration or employment laws. It should be fine...

Go ahead and send the birth certificate in response to the RFE. Please make sure that you send along a certified English translation of the birth...

I agree with the above answer. To clarify your question regarding ability to work after your I-130 is filed, a person is generally eligible for...

You may qualify for a fee waiver if your household income is below 150% of the poverty line per HHS guidelines for the current year, or based on...