Do you have heartburn or is there bleeding in your oesophagus? For now, avoid acidic/spicy things including citrus fruits, coffee, tea, chilli, curry, etc. Also avoid eating food when it’s hot. Let it cool down first. See your gynae for anti-nausea meds. Try some ice cream, if your body can accept that:)
Best to consult your gynae, do not self medicate, take care!