You are most likely suffering from an acute allergic reaction.
In case you develop difficulty swallowing, swelling in the mouth and throat or trouble breathing or the condition deteriorates kindly go to ER.
It requires urgent treatment.
You may tide over the current episode with the following.
The way to manage your condition is to have antihistaminics working round the clock.
This can be achieved by taking medicines at regular intervals.
You may take a strong antihistamine like Atarax(Hydroxyzine) 25mg in the morning and 50 mg before sleeping. This is very effective, but a prescription medicine.
If sedation is an issue, and you want to avoid sedation, do the following.
Fexofenadine(180mg once a day) has the advantage of being non-sedating,
You may use Fexofenadine 180mg daily once. Available OTC.
Apply 1% Hydrocortisone cream twice a day for 7 days on areas of excessive rashes, and then once daily in the morning for another 7 days. Aveeno's 1% hydrocortisone anti-itch is a good brand.
It is not as effective as sedating antihistamines(mentioned above) in Urticaria.
Do not apply Calamine lotion as sometimes it may aggravate the situation.
Do not bathe in hot water, use a lukewarm shower.
Use a cleanser like Dove bar, Basis, or Camay. Don't use soap.
Additional strategies that may be helpful include.
If itching is severe- apply a cold compress and keep a good anti-itch cream like Sarna (Camphor+Menthol) in the refrigerator and apply it cool, feels much better.
Avoid stressful situations as much as possible. Ensure a good night's sleep of 8 hours. They are well-known triggers.
Lastly, if the condition does not improve or deteriorates kindly see your doctor for further management.
Please let me know if this was helpful. In case you require any further assistance, do not hesitate to contact me. I am happy to help!
Wishing you the very best in life.
Thank you for the opportunity to help.
Positive feedback is requested.