lostone,
I'm sorry how awful you are feeling. Anxiety is extremely distressing.
It sounds like the doctor you saw is not very good with mental health.
I would suggest that you see another doctor and ask about seeing someone who offers talking therapy. You should not be dismissed by anyone for this condition. It is disabling and distressing.
In the meantime see if you can find some coping stratergies.
You could try-
Distracting yourself by playing a card game,listening to music, something that you like doing to take your mind off it.

Slowing your breathing down, use a paper bag if you need

Relaxation, go and buy a tape and practice it every day.

Thinking of you.