psoriatic arthritis
"After becoming sick with this disease doctor initially started me on methotrexate pills and I developed what they call "phantosmia"...I smelled horrible things that weren't there.  So we switched to injections and didn't get the smells anymore.  Then he started Enbrel as well.  I felt good for awhile and decided to stop the methotrexate because it was making me tired and weak.  Two years later, I'm back on if because my back and neck were killing me and  I'm getting 60-70%r relief after one shot of .8.  Pretty happy about that but the trade off of sleeping all day and being weak and nauseated all reminded me of why I stopped too.  But it does help so you weigh what's important to you."