Quite an interesting question you have posted. I have been normal weight, over weight, under weight, you name a size and I have probably worn it!
I just wanted to say that you, and I, and everyone else in the world, will probably always be discriminated at some point in time through out our life spans. Whether you are discriminated because you are over weight, under weight, a man, a woman, your skin color, your age, etc. It happens. And it's sad that it happens but you are not alone. Always try to keep an open mind and if someone does discriminate against you try to educate them and prove them wrong. If you can't educate them and open up their minds take solace in knowing that you tried and that it's their loss, not yours. Being overweight is not going to make you a worse nurse. Like another poster said, it may make you an even more compassionate one.
I haven't had too many rude things said to my face while I was over weight but I did have a few things said to me when I was underweight. People just assumed that because I was skinny I was anorexic and a nut case. I have been discriminated at work because I am a young married woman and it is just assumed that I will get pregnant and quit so what's the point in teaching me how to do my job if I will just leave.
Having worked in Human Resources I have seen all kinds of workplace discrimination.
My grandfather always used to say "There will always be someone smarter, faster, prettier than you, that likes your or doesn't like you, but you know who you are and if you try to be the best you possible, that's all that counts."