Hello and hope you are doing well.
Hives develop in response to an allergic reaction, by the release of histamine. The allergen can be medications, food, extremes of temperature, exercise and viral infections to name a few. Since you developed the outbreak along with joint pains and fever, it could be a response to an infection. So, therapy lies in resolving the infection and anti-histamines. If the present antihistamines are not very effective you can consult your doctor for long acting ones. Sometimes steroids may be needed to control the allergic response. Please consult your primary care physician for further evaluation.
Hope this helped and do keep us posted.
Read my answer below , same applies top you check out allergies to the chem trail