How do you get rid of a really bad sunburn in less than a week?

To alleviate a severe sunburn quickly, start by cooling the skin with a cold compress or a cool bath to reduce inflammation. Apply soothing aloe vera gel or moisturizing lotion containing ingredients like hydrocortisone to relieve pain and hydrate the skin. Stay well-hydrated by drinking plenty of water, and avoid further sun exposure while the skin heals. If the sunburn is severe or blisters develop, consider consulting a healthcare professional for further treatment.