How do you change your hate into love?

I hate some co workers in my department. Lately, I have been ill and the bouts come and go which has caused me to miss alot of work. It seemed every other week I would have to take off a day or two. This is not intentional I have been going through something and am being tested for various diseases (Lyme's, lupus, etc). There is a woman (Jan) whom I work with who has some health issues also. I would say a good portion of the anger is coming from her. She talks about me to my co workers. *Jan* has even said to me "Give me a little bit of arthritic pain and joint pain anyday instead of what I have. I can use heating pads with some Naporyxn and go to work however I would not want to deal with the kind of pain I go through or even spine pain like *daisy* goes through." Daisy is my other co worker who spine gets out of whack because of her years of competing on a professional level in gymnastics and fitness. Previously, I was working steadily and did not have these health issues. I feel really bullied from these two women and I have actually spoke to God and told Him I hate them. So my question is how do I let go of my hate I feel toward these two women?