I have health anxiety and a particularly bad fear of blood clots. I currently have a weird sensation at the back of my left knee. If I press on the area it feels bruised but not on the surface, sort of deeper inside in between the two tendons on either side. I have a similar sensation on the side of the knee as well. Knee feels off but I don't know how to describe the exact sensation. There's no obvious swelling or throbbing sensation and I'm not particularly short of breath. I've had a feeling of my veins around my thighs and knees being bruised before and not really sure why. My anxiety is extremely high at the moment due to recent illness. I'm trying to rationalise but it's not working. Can anyone help?