Hi, thank you for asking Healthcare Magic. I have gone through your query and understood your concerns. From this description, I believe what you have abbreviated as dvt is deep venous thrombosis. Bee sting most often leads to local reactions but in some people it may lead to a life-threatening reaction (anaphylaxis). Fever is not often present in any of these conditions. I think the cause of fever in this patient if from deep venous thrombosis. Also, in deep venous thrombosis, there is severe pain in mobilizing the calf which may interfere with movement and might be misinterpreted as stiffness. I hope I have answered your query. I wish him good health