My husband has had surgery for Cholesteatoma and nows has problems with vertigo. Could he qualify for SSI?

My husband has had three surgeries for Cholesteatoma. The last surgery caused him to have vertigo. He got really sick and had to be off work an additional week because of his balance. He still isn't back to normal but pushes himself each day to get through the day. I honestly feel he shouldn't be working but I'm not sure what to do. He doesn't sleep well and when he does he has nightmares. He is also irritated easily, headaches often, and just doesn't say much anymore. I feel like he may be having problems with depression because he just can't seem to get well. Any suggestions for me? He visited his ENT two weeks ago and told him about the headaches and dizziness again but the dr. just says he will get better eventually. His hearing still isnt' back to normal either.