What Causes Itching Throughout The Body, Nightmares And Insomnia In An Elderly Person?

Question: hello, I am having weird symptoms since yesterday. In the afternoon I started itching. It felt as if it were coming from the inside of me. My whole hand itched then arms etc etc.. Later on that night I began having horrible dreams; not scary in terms of monsters etc but dreams that literally jolted my stomach into reactions each time. My whole body would tighten up and I would feel as if I was going crazy. I am 56 and this has never happened before. I slept until ten am but really I was not asleep, just awaiting the next : episode. Then this afternoon the itching began again. I felt like I was going to go through the roof. I was walking fast around the house, racing. I am asthmatic but it was not asthma. As I type this I am a complete nervous wreck; took tow 25 mg benadryl along with two .25 xanax. Believe it or not this is a whole lot of medicine for me. I have major restless legs too and my legs just move while I am laying down. I point them in the air, etc. What the heck?