Do you have a plunket family centre in your area? They are great you can go along for the day and just get some help/time out, you don't need a specific reason for going but you could ask them for help with feeding/sleeping or just use it for some time out.
Definitely come on here and have a look at the allergies/reflux section, you will get tons of help from lots of people who are in or have been in your situation.
I would also look to join a coffee group, my ante natal coffee group has been great, and I have made great friends with one lady who I meet up with 2-3 times a week, we have totally kept each other sane.
Getting out for a walk is great as well, you will be amazed how different you feel for just leaving the house, and being in the pram normally helps them go off to sleep as well.