i filed tax returns in a foreign country, can I qualify for a fha loan
FHA insures mortgages for borrowers with lawful permanent resident alien status using the same terms and conditions as those for U.S. citizens.The mortgage file mustoinclude evidence of the permanent residency, andoindicate that the borrower is a lawful permanent resident alien on the Uniform...

Can we refi from conventional to VA?
You would have to pull your husbands VA eligiblity form to verify. This can be found on the va.gov under Veteran Services. But yes you can. It would be considered a standard refinance from convential to VA. Hope this helps.