Hi Sal x

All these symptoms are part and parcel of anxiety and nothing to worry about. I can honestly say that I am well on the road to recovery and still get the occassional tingling face and scalp.
It used to freak me out as well but I just live with it now as I know it can't harm me.
You are not going to collapse, try some relaxation and deep abdominal breathing.
I find getting some fresh air helps a lot as well.
Hope this helps
Fell free to PM me if you want more reassurance

Take care

Elaine x