Hi, I'm 26 and I've finally been diagnosed with Fibro (after, now looking back, many years!) as well as ME/CFS and IBS (again after many years).
I take amytriptyline for the fibro - and the doc has now given me a variety of mg of tablets so I can "find my own level" which I think is hilarious! It still doesn't get away from the fact that it seems to be a trade off though: I can be awake and in pain (having too little a dose) or asleep/completely zombified and have manageable pain (having taken a little too much). There doesn't (as yet) seem to be a happy medium (but then that also seems the case for levels of activity, esp with the ME).
As for the benefits system, it's probably better not to get me started! At the moment (only just) I get the lowest level of DLA but have turned my mobility application down. I'm hoping that as I nearly collapsed in the DSS required medical exam yesterday they might overturn that decision. If it goes on unsuccessful much more I shall be visiting the CAB for backup. I'm interested that Welshbit says a letter from the GP will sway the blue badge folk - I shall look into that.
As to
vivatifosi and the enthusiasm of Welshbit - I thoroughly recommend checking out the other products on that site too... one of my favourites is
"my disabling chronic illness is more real than your imaginary medical expertise" 
but there are others too

I also recommend, to all you out there with an invisible illness... check out butyoudontlooksick.com and have a look at the Spoons Theory (
http://www.butyoudontlooksick.com/the_spoon_theory/) I found it a fantastic way to explain to people about living with ME (for example).
Might help..? :rolleyes: