What to do as husband very sick now!

I'm quite thankfully in remission since my DX in 2010, on Arimidex until August 2015. Prior to my DX, I had (and still have) a very debilitating chronic illness for which I receive SS and private disability. I'm (very) unfortunately unable to work; my disability is not temporary.  

My husband owns his own small (one man) business and has always been there to support me emotionally and financially. A couple years ago, he was diagnosed (at an esteemed hospital by a rheumatologist) with psoriatic arthritis. They prescribed methotrexate, but he didn't take it. If methotrexate doesn't work or isn't tolerated (frequently), the MD can request the insurance provider to prescribe biologics (Humira, Embrel). Hubby's dad had another type of serious arthritis and got lymphoma from methotrexate, a known risk, along with other life-threatening other risks to body organs. His dad died of the lymphoma. Hubby has to date avoided methotrexate due to those fears and a likely inability to work, as methotrexate is not tolerated well, with bad nausea and other immediate side effects, even when it does NOT work. Even a few days off work are a serious issue for us, so even if he does take methotrexate, he has to be well enough to work. 

I want him to see a naturopath at our large naturopathic college in the area, and then get second and third MD/rheumatology opinions if necessary, as some patients do NOT take the risky methotrexate/Humira/Embrel route and manage well. If hubby is disabled, we are *really* in a serious bind. He could become disabled immediately from taking those meds OR gradually from not treating at all. On a scale of pain and disability, I'd say he's already an easy 6. He limps noticeably around clients, works in some degree of pain every day, and is exhausted by early evening. 

I'm not asking for medical advice, but just your gut impression. We can't afford double disability and don't even know if he'd be approved. We have no family and extremely limited savings, only enough to ladt months at best. The stress and worry cause us both to suffer worse physically. I'm completely disabled or would immediately go to work. 

Any opinions? Just personal opinions, not medical, if you were in this situation? Hubby is 60 years old and was the epitome of fitness and health until this disease struck. Thanks for any advice or thoughts. Sorry if it seems off topic, but it radically affects my heakth, too, with constant worry, stress and depression. For what it's worth, one child is getting their Madter's and just starting their life. We have no other family to help us emotionally or in any way.