Hi Nancy,
My husband is one of those PALS with very rare respiratory onset ALS, yet he did not get diagnosed correctly until earlier this year. He started with breathing problems in spring of 2011 (we can remember him huffing and puffing on the stairs and saying he was out of shape.) All of his problems have been misdiagnosed as related to either heart or diabetes, when the ALS specialist says it was clearly ALS.
Yet after all this time with no treatment, my husband's FVC is still 63%. He just started using a BIPAP. So please don't panic, even with the supposedly poor prognosis of respiratory-onset ALS, my husband is doing relatively well, is still completely ambulatory, dresses himself with occasional help. He also has FTD, and that's what is causing him the most grief. My husband has forgotten so much, and is often bewildered by what is going on around him.
I agree with everyone else however, you need an ALS clinic pronto. They are just a fabulous source of help.