Is this Acid Reflux and Heartburn?

I'm new to this Acid Reflux and Heartburn stuff :) so I have LOADS of questions for you girls!

I have just been reading another thread on it and I've never had either prior to being pregnant but now I'm thinking that I've been suffering from them for quite a few weeks.

I seem to be getting only night nausea at the moment and I'm wondering, is it NOT nausea but infact just Acid Reflux and Heartburn making me feel Sick??

Any suggestions on what to take to try and calm it down?

Any suggestions on Foods to steal clear from?

I also read somewhere that it is caused from the Baby putting pressure on the placenta - both scans we have had, showed bubba pretty much using the placenta as a body pillow and curling up on it. So would this be the reason that I'm suffering from it?