Hi, since last March I’ve had knee pain that has slowly spread to my shin and the pain has gotten worse. I’ve noticed that when I walk I have a slight limp and if I’m standing up / walking for a few minutes then I find it difficult to breathe and I have to sit down. About a week ago I felt this pain behind my left ribs that stops me from leaning on my side. Since I felt this pain I’ve noticed dark red / brown streaks of blood in my stools. I also don’t have much of an appetite and if I eat or drink I become hot and shaky and nearly throw up. Since my knee pain started I noticed that I was getting tired a lot but it has gotten worse since my side started to hurt ( napping for about 4 hours a day). I have low levels of vitamin d so I was wondering if that could cause these symptoms or something more serious. I’ve also noticed a few bruises on my body, two being on my back but I haven’t knocked it on anything so I don’t know why there’s a bruise.