I was sent home from work this morning due to me having the following symtoms and i'm scared stiff.

For about 3 weeks i have had spine pain radiating round to the liver area and i feel sick,a dull achy sick feeling.With this pain there is a horrible fear sensation that wooshes from my back and abdomen right to my shoulders then head.I then want diarhea and feel sick.I feel weak and exhausted.
Is this panic ,is this panic.I do not believe that it is.I console myself with the fact that my wieght is staying the same.(16st , 6.0 tall).I have read and read the symptoms page and still can't believe this is panic or anxiety.I have had anxiety for well over 25 years but it never came to this,i always coped with just mild shakiness and a feeling of aprehension but no bodily symtoms like this.If this is panic /anxiety why am i not dealing with it the way i did previous to my first real bad panic attack 9 weeks ago? Help please plaese.