It depends what (if anything) is causing it. Lower than average blood pressure only becomes a problem if you are symptomatic- which could indicate that blood pressure is so low it is unable to push blood around the body sufficiently. Certain diseases and medication can cause this to happen and this must be excluded first of all. How long ago did you stop taking the medication, which antidepressant was it and what was the dose? If you are having chest pains then I suggest you see your Doctor today so they can run further tests. If you are only symptomatic upon standing, this is called postural hypotension. What’s basically happening is when you stand up, blood is pooling in your legs. This reduces blood pressure circulating your body. The sudden plummet in BP means there is an inadequate blood supply to the brain, resulting in dizziness. In most people, baroreceptors in the body sense the sudden drop in BP and quickly aim to resolve the problem by making the heart beat faster and pump more blood which will of course rectify the drop in blood pressure. The vessels should also constrict, which increases resistance to blood flow, elevating BP. With Postural Hypotension, something prevents this normal bodily function from occurring. Problems like diabetes, heart issues, Addison s disease and as I mentioned above certain medications, can cause this. Your GP should do blood work -including checking your iron status and ECG monitoring. If there is an identifiable cause, treatment can be provided and the problem should be resolved. In the meantime, keep hydrated and stand up slowly. Edit In that case, your symptoms may not be the result of your blood pressure, you need to see your Doctor so he can run more tests