Anxiety could be causing the nerves in your back to cause you to have chills. I do not think that drinking has anything to do with this, but you might want to tell your doctor about anxiety and get some medication to fix this.
nerve spasms? mild allergy to something in your alcohol? mild hypoglycemia? could be a lot of things Sugar.
Welcome to the MedHelp forum!
Skin crawling is seen in people who are very anxious and stressed out. Take up yoga, deep breathing exercise, walking and remain strong and determined in your effort to do away with this habit. Music and aerobics are also good stress busters. Drink plenty of fluids and water (not caffeine), eat fresh fruits and vegetables and keep yourself busy throughout the day.
Very dry skin and disorders of thyroid gland all can precipitate a crawling sensation. The other possibility is Morgellons disease often mimics scabies. The disease is believed to be caused by weak immune systems in people that have contracted the tick-borne Lyme Disease at some point in their life. It can also be a fungal infection like Tinea corporis.
It is difficult to comment beyond this at this stage. Please let me know if there is any thing else and do keep me posted. Take care!