Poor laddie. I suppose just seek plenty of advice from hvs and those with experience of a refluxy baby - although as kumber just said, it didn't seem to make much difference for her son :-s
I believe a baby's digestive system is supposed to develop to be much more under control by 6 months, so things should get better!
Sleep wise, my 7 month old usually still wakes twice in the night, and can't go much longer than 4 or 5 hr stretches and she devours loads of food during the day lol - food definitely makes no difference to sleep