In reply to Sleepymrsp:
> having a lot if muscle weakness after years of struggling with chronic fatigue syndrome and fibromyalgia that a) I'm too heavy and big for the equipment and b) I won't be able to do it anyway.
One of the lovely things about climbing is that you can work entirely at your own pace, without pressure.
There's no baseline level of how fit or strong you have to be before you can start climbing. As people have said, if you can climb a ladder -- possibly even if you can't -- you're already fit enough to start climbing. There should be routes/problems which aren't any more difficult than that.
If you've not got a great strength-to-weight ratio initially (which was very much true of me when I started climbing, as I was very weak), then overhang and vertical walls will be tougher for you than slabs. But that's true for lots of people, and just means you have to develop great technique from the start. *g*
If you're still dealing with CFS and fibromyalgia, then I'd guess the biggest issue will be pacing yourself and working round flare-ups. But you probably already have a very good idea of how to listen to your body and adjust things accordingly.
There's actually more than one very strong climber with CFS:
http://www.ukclimbing.com/news/item.php?id=42747
http://www.ukclimbing.com/news/item.php?id=69781
Not to mention many others with other chronic illnesses or disabilities.
Here's an old thread with people discussing climbing with CFS:
http://www.ukclimbing.com/forums/t.php?t=390968