Ive come out in a rash all over my body which is red and raised and when you touch it's warm and really itchy and i also have a blocked ear help??

Hives/Urticaria: Sounds like hives. Most common cause is infection (often very minor in nature) resulting in activation of innate immune/autoimmune pathways in skin that trigger mast cells. Usually, hives resolve and we never know the cause. For other causes: http://emedicine.medscape.com/article/137362-overview#aw2aab6b2b3aa. A virtual consult to discuss triggers can help. If no contraindications, try otc Zyrtec (cetirizine)