Well if you want someone to talk to about your anxiety and stress levels, I prefer a therapist or Psych Central because bosses don't usually want to be my therapist.

If I am going to meet with my boss, I would have a written presentation that I go over with major points of how your job has increased over the years. Maybe 3 people used to do your job. But with shrinking budgets maybe there is no other option they see. So I would put out trial balloons about any talk of hiring a part time person to help. Of course you don't want to create the idea you cannot handle it. I am not sure if it is better to suffer in silence or not.

I think one thing I would stop doing is bringing work home unless you are getting a really high salary. Taking on the problems of your boss and compromising your health is a definite no in my book. If they want you to work overtime and pay you for overtime maybe that would be acceptable.

If your boss is not empathic, he could be a slave driver. Finding another boss might be another option.

My parents used to say the devil you know is better than the devil you don't. Bosses will let you work yourself to death and make them look good and you might get a pat on the back. Take care of your health. You are approaching or in burnout. Self care is the path I recommend.

PM me for more specific lifestyle changes like exercise, mindfulness and music.