Hello Ian,
It sounds as if you need to see your doctor.
We can't diagnose people from their messages.
We can offer advice and suggestions, but we don't know what is happening.

If you continue to have difficulty breathing and swallowing like that it's extremely important that you contact your doctor ASAP or if you can't contact your doctor please go to the Emergency Room at your nearest hospital.

If you feel as if it is an emergency please call a friend or relative to take you to hospital.
If you feel it's an emergency and don't have someone there with you, please call 911.