I recently received a letter requesting more evidence to support my husband's green card application. This was requested because of the affidavit of support. I had to get a sponsor because my income was not enough. How will they calculate my income and the sponsor's income? Will it be calculated together? I already sent the documents and I am worried that I should have sent more. I am scared.What happens if I did not send enough evidence after they sent the RFE? I would really appreciate your help.

If the income is insufficient he will be denied. The sponsor is willing (apparently) to support your husband if you cannot?

In case you need joint sponsor, the sponsor's income must cover his/her family and you.