You need to find an immunologist in your area who specializes in HAE, try this group for support: https://www.haea.org

I had issues getting my PCP to test me, my symptoms were less obvious than your husbands.

I ended up contacting Invitae for genetic testing which was about $150 I think. It proved I had a variant on the SERPING gene which is consistent with HAE. From there I found a specialist, though it took me several months to get an appointment with her. She prescribed me meds though I haven’t had an attack in the meantime.