Could be reflux as well - I've had silent reflux / gastritis since before I became pregnant and that's always made me feel breathless after eating
Defo 3rd trimester symptom. Try lifting your Breasts for a minute or so and taking deep breaths. This helps me a get a bit more oxygen in
Yeah I'm similar, but worse during eating I'd say, just pretty bunged and less lung space now that I'm 3rd trimester i think!