90 • feeling: anxious, nervous, confused, abnormal, jittery or slow; seeing or hearing things that aren’ t really there, inability to sleep, reduced consciousness, lack of concentration, disturbance in thinking, numbness, loss of balance, migraine, movements disturbance, vertigo, problem with speaking, ringing in the ear, ear discomfort • disturbed or blurred vision, red eye, abnormal sensation in eye, observing flashes of light • unusually fast or low heart rate, hot flushes, raised blood pressure • shortness of breath • one or more of the following problems in the mouth: ulcer, loss of sensation, discomfort, blisters, unusual colour, soft tissue disorder, tongue disorder, painful or blistered or ulcerated tongue, gum pain, chapped or dry lips, oral thrush, tooth disorder, toothache • heartburn, loss of appetite, uncomfortable stomach, indigestion, stomach pain, inflammation of the oesophagus • cold sweat, swollen face, rash, generalised itching, hair loss, brittle nails, muscle pain, muscle twitching, muscular weakness, back pain, weakness, feeling unwell, chest discomfort, thirst, chills, feeling cold, feeling hot, falls, difficulty passing water • drug withdrawal syndrome