GlassOlive, I feel so bad for you--what a dilemma! 
Sometimes these doctors just don't live in the real world! Did you ever explain to him about your job...that his recommendations just won't work for what you do? If you haven't, I would try to talk to him about the type of work you do, and maybe he could revise his note to give you the time off. (As a side note: How, in this day age, and with what is known, can a physician not "believe" in fibro?! That just infuriates me!) 
Alternatively, could one of your other doctors help by writing you a note from their perspective?
I'm on SS Disability, and first of all, it doesn't matter if the doctor says you can do "some" work--even once you get on Disability, you can work some, and make up to a certain amount per month without having your benefits taken away. (The last I knew, it was about $800.) You just have to be unable to hold a full-time job.
Another thing about SS Disability is that they look at all of your health issues together, and even though individually no one condition may be disabling, they could view the conditions all together as disabling.
The bad thing is, even once you get on SS Disability, your Medicare benefits don't kick in for two years from the date you were deemed disabled, so there would be no point in pursuing it, since you're eligible for Medicare in a year now anyway.
Perhaps you could get a note from each of your doctors, and take them to your employer. If your employer would then allow you to go onto their long-term disability plan, you could do that, and hopefully stay on it until the year passes and you're on Medicare.
If your employer wouldn't let you stay on it for as long as you need, you could go back to work periodically, try the job on a trial basis, then reiterate that you're unable to perform the duties. This may require another trip to your doctors to get notes, etc., but it would allow you to eventually get you through the year, with your insurance benefits intact.
I don't know if I've been any help or not, but I'll try to answer any questions you have if I haven't explained anything well enough. I certainly feel your pain...your fibro sensations feel very similar to mine, and for the first time in my life, (I'm 52) I've begun having panic attacks too, so my heart goes out to you! Best of luck--stay in touch!!