Do I have a case of discrimination, bullying, harrassment, etc?

I have worked for a private practice MD for 13 yrs. During all this time and more recently this week, he has different set of rules which constantly change for me v/s other employees. He makes loud, intimidating statements in front of other employees to me , ex if I am 2 min late, first time in 6 months, stay over, early on other days, I get yelled at and job threatened and "talked" to. Others are not. Anything I say is twisted out of text. Only asks office manager if I was busy when he was out v/s other staff. which I was. Never have had a break. I do my job and cover for others, unasked, but get no credit. If he is ill all I have to do is look at him wrong. Lots of petty things he has done but I now have high BP and headaches and work/wall on pins and needles for my job because Im a single mom that need her job so that seems to give him a boost. He has been very rude, sarcastic, double standard rules all the time.