Please please, go to the doctor! Whereas it all may be just fibro, that knot in the neck sounds concerning. Please get it checked out right away.
If it turns out that it's fibro, I can only send you my heartfelt commiseration. Work and fibro people do not seem to mix, and yet work is what gives a lot of us purpose.
Since it sounds like you have your own business going, can you set your own hours? Can you set naptimes for yourself? I find if I nap thru portions of the day, I'm usually human again in the late afternoon. Or can you only work a few days and/or hours at a time?
I sure as HECK wish I had more to offer. It's extremely difficult. I've only been working since May, 3 hours a day, 5 days a week, and it's killing me.
Fibrokitty mentioned a medicated cream that she gets thru prescription that helps. Maybe you could get some? It's in her thread about dialudid. If you can rub it in, maybe it would help ease the pain in some of the worst spots.
Dizziness - some have said magnesium helps for that, I believe. You might wish to go back and reread the most recent threads on the matter. But I hear you. I had to lie down today (Sunday) and sleep for hours due to it and fatigue.
Fatigue - you need sleep. It seems that the more we do, the more stressed we become, physically and otherwise, and the more sleep we need.
Numbness - have you seen a neurologist? That's what my rheumy suggested to me. I haven't followed up with it yet. Feel too doctored out, at the moment.
Unfortunately, you're right, it's all (except maybe the neck thing) fibro stuff. I'm sorry. I know how hard it is for you. Just come here and we'll do our best with advice and suggestions. You'll find some helpful hint in our threads. IF you go thru the ones I've highlighted to you, you may get some relief from your woes. I also had a thread about dizziness (you can use the search bar at the top to find it) wherein a lot of good suggestions were made.
Good luck!
Yours in fatigue,
Petunia