I'm Generally Very Healthy. I Am 58 Years Old, Female,

I'm generally very healthy. I am 58 years old, female, I work as a legal secretary, and I am a marathon runner. I've had extreme stress in my life, especially this past year, and the stress was heightened last Friday morning after a meeting at work following my boss's resignation from our firm, and finding out he gave me a terrible performance review (that I feel was untrue and unwarranted) that is jeopardizing my employment. I'm a single Mom of a teenager, and I pay all the bills--mortgage, expenses, etc. I also just left a 12-year relationship with a mentally, verbally, and emotionally abusive partner. Late yesterday afternoon I almost passed out at work, and I've been dizzy, nauseated, and weak ever since. Over the weekend I also had a "sour" taste in my mouth all the time, and I would feel sick every time I ate. I also couldn't eat much because of the stress and depression (for which I have been going to therapy).