Sharon, I used the little picture icon an entered the url for your original picture. If you do that and then click anywhere inside the little pop-up box, it will give you the dimensions of your picture--in this case 640x480. I just adjusted those figures by half before posting., ie., 320x240.
And I am very glad that you are all right. Not glad about the residual effects, of course, but I am glad you weren't hurt worse.