If your baby has reflux you might want to think about getting the amazing 'cocoon-a-baby' mattress from red castle. My french friend gave us one for our little one and it is lovely, he sleeps so well in it. But it also helped her baby with reflux - they only really discovered their daughter had bad reflux when they moved her out of it.
The mattress was developped by the Marseille neo-natal ward, and they now make it for full term babies from birth to about 5 months. It hold the baby at a slight angle and the knees are tucked up so it mimicks the fetal position of the woom. It is also supposed to reduce SIDS and flat heads.
I obviously can't promise it will cure your babies bad reflux but might we worth trying. Even if it doesn't it is a lovely cosy mattress, and babies sleep well in it. Our son has been sleeping through the night since about 2 months in it. It is also practical if you go away - you don't need to take a travel cot or moses basket, you can just take the mattress. It is expensive at about £150, but I really can't recommend it enough.
Unfortunately I can't seem to find any UK websites that have it, but this is it on the redcastle website (in french):
http://www.redcastle.fr/?id=171
And these are links to buying it from french shopping sites:
http://shopping.cherchons.com/dossier/c ... astle.html
Must be tough having a sick little one - good luck with it...