Woke up to Itchy Rashes/Hives

I woke up in my hotel room early Tuesday morning to an itchy rashes on my right hand. I started scratching and it felt like my whole body's itching. I took my blanket off and sure enough, I have rashes/hives all over me.
itchy rashes/hives comes and goes and in a different patterns every time

sometimes the rashes covers the whole entire arm and it's very itchy

another pattern of rashes/hives
This is how it looks like when I woke up the first day.

I have never had something like that before. I called my doctor and he told me to get Claritin, zyrtec, and benadryl. Few minutes after I took claritin, the hives started to clear and so was the itchiness. However, after few hours it came back again.

Rashes/hives came and go. It changes forms but it didn't matter how it looks, it was pretty itchy.

When I got home from my trip, I took benadryl and went to bed. After couple hours, I woke up feeling nauseous and just didn't felt good at all. I went to ER, the doctor gave me benadryl IV and prednisone. After few minutes, skin cleared again.

Wednesday, Thursday and Friday, itchy rashes/hives was on and off. Sometimes it was more of an on than off.

Saturday morning I woke up to a clear skin. And it has been days without any rashes or hives. My lab test came negative as well. I do believed that what I had was Cold Urticaria. I will never know for sure until I get allergy tested for it.
arm covered all over in red and very itchy
Sometimes it covers my skin red, itchy red

itchy little red dots on my skin
Other times just little dots, itchy red dots

different pattern of rashes or hives on my skin
This what it looks the last night I had it, the next day there were no any trace of it. 

Itchy rashes or hives all over my face

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