nausea and upper abdominal bloating

Hello, I am 67 and currently waiting for an appointment for vaginal bleeding. I'm on omeprizole for nausea but every morning without fail I feel really sick as soon as a bit of food is swallowed. I don't have pain and I haven't lost weight but it's the nausea I'm finding it hard to cope with. I get periods when I eat really well and forget about how nauseous I have been. This is followed by a good day but then it statrs all over again, nausea and upper abdo bloating. I really find it hard to cope with the nausea and wondered if anyone could give me some advice as to what it could be. If it's due to a cancer then I have to accept that. I'm sitting here feeling so sick again now and there's no way I could go out shopping. But in the evenings I seem to eat really well. Any help would be much appreciated. Thank you, Sarah.