Three things are familiar to me from your 'anxiety'. As a site manager of a 24 hour remote site I had these feelings (mainly due to pressure of meeting production schedules.), over many years. I am now 'mature age' and the results of this anxiety over a long term are now evident (heart disease to which stress aggrevated.)
Firstly, this seemingly simple anxiety (part of life, some say), can turn into depression. Its simpler to 'manage' it while its anxiety and before it develops.
Secondly, don't ignore the physical aspects. Many of the 'symptoms' you describe are similar to heart condition symtoms. If you think your anxiety is caused by 'stress' ( as mine was) keep a close eye on your heart with your doctor (I believe the two are linked).
I found that my anxiety reduced as I reduced (or managed) the stress in my life. I mainly did by this practicing deep breathing, visualization, meditation, and yoga (Lots of info on this site, but also Zen buddahist sites), I also personally use hypnotherapy.
Hope this helps (to know your not alone with this)