Something I ate

Last night I didn't crawl into bed until almost midnight because I knew that I could sleep in today. Well that was all well and good but then at around 2:50 am I woke up because my arms felt like they were on fire. I had had an itch and so being the normal response I itched them. Well right after they fired up. I got up and went to the bathroom and noticed that they were both really really really red. There were also bumps and welts almost. So instead of panicking like I would normally I decided to take some Benydryl and wait 30 minutes. If they didn't change then I would have to make an early morning trip to the emergency room. Luckily I was able to fall back asleep and when I woke up at 10am (that is late for me) the redness and bumps were gone. I still have no clue what could have done it. I did move around some stuff that had dust on it but that was earlier in the day. It could have been the pill I took before bed but I took that around 7pm. I am going to have to call my doctor tomorrow to see if there is something else I can take instead. The only thing I ate before bed was a bag of fruit treats.