Your reactions are spreading to more foods over time, and now include breathlessness and coughing right after eating. This does suggest a worsening food allergy. Your asthma history raises the risk of a more serious reaction. This isn't full-blown anaphylaxis yet, since that usually also brings throat or facial swelling or a drop in blood pressure, but it is moving in that direction and needs proper testing.
Next Steps
See an allergist or doctor for skin prick or blood IgE testing to confirm your current triggers, since these can change over time as yours have. Keep your asthma reviewed alongside this too.
Health Tips
If a reaction ever brings throat tightness, lip or face swelling, dizziness or fainting, treat it as an emergency and get to a hospital right away.