I have developed a rash on my body and swelling face which gets worse at night/the morning...I think I have hives. What are the remedies and causes?

Allergist. It appears that you're experiencing hives and angioedema which are allergic type reactions often to something internal or external. However the offending agents are often elusive. Your best bet is to consult an allergist who will investigate and treat.
Urticaria . There are a variety of causes heat allergic secondary to viral illness secondary to other skin or immune conditions. Please see a doctor for examination and testing.