depression
"After a month of taking 37.5mg of venlafaxine a day I began to experience palpitations, breathlessness, fast pulse rate and other unpleasant but less serious side effects, occasional staring spells, jerky movements and strange sensations in my neck and head. My GP told me to discontinue the drug straight away. I've been off venlafaxine for 2 weeks, although the breathlessness eased after a few days I'm still have fast pulse(over 100bpm), palpitations and an overall unwell feeling with aches/pains and strange "turning" sensation in my head which leaves me feeling spaced out for a minute or two after. My mood is currently worse than it was before taking the medicine."