I'll be 4 weeks out tomorrow and I'm suffering from the same thing. I can't tell if its hunger or stomach acid. I'm taking PPI and and calcium carbonate but my stomach still feels uncomfortable. Food only satifies for 30 mins or so, then the hunger feeling comes back.
No I'm not hungry all the time. 100ml of custard is enough to fill me up, but as soon as i drink anything with in a few minutes I'm hungry again. It puts me off drinking.