When should medical attn be sought for alcohol withdrawal? Drinking 7-8 beers/night for 2 yrs. Sober 48hrs. Nitesweats, fast heart, sleep trouble

Usually. Symptoms are not apparent for 5 days or so after the last drink. However i would seek medical attention based on what you are reporting.
Your symptoms are. Suggestive of withdrawal from alcohol. See your dr asap for treatment. Take care! http://www.M.Webmd.Com/a-to-z-guides/alcohol-withdrawal-symptoms-treatments.