First, are you in therapy to see if you can change this kind of thinking? Second, you can't diagnose yourself from the internet. So many people on here do this, but you can't because the same symptoms will show up in hundreds of possible problems and you don't have hundreds of problems. The internet can be helpful when you have a diagnosis and a recommended treatment to see if your doctor is doing what seems right when it seems wrong -- but before a diagnosis it's useless. It just makes you crazy. If you really think you have a blood clot, see a doctor. If you really think you don't, see a therapist.