I quit venlafaxine cold turkey because insurance denied it. It's been 5 days. Started feeling dizzy, nausea, headache, generally 'icky' yesterday. My blood pressure is 91/69, pulse 105, weight 115 (female, 51 years old). I'm 5'2", in good health, work out 5 days a week. I was taking Venlafaxine for hot flashes, not depression. Should I be concerned?