Our expert says:
Sounds like a blood pressure thing, based on the fact that it happens when you stand up. That happens to many people, it's called orthostatic hypotension. It wouldn't be picked up by a basic check, because the pressure only falls when you do exertion or lift weights, so it's not a chronic thing, but an acute one brought about by how the body adjusts the circulation when you lift weights. There is an increase as the pressure builds up during the lift, and then a decrease after.
There are a couple of conditions that can cause this, however. It can be quite normal, and nothing to worry about, but it's good that you've had a few basic checks. That said, I'm not sure what they've checked, so I can't comment on whether they've eliminated the important things.
I don' tthink its the shake. It may be related to the anti-depressant, that's not my area, though it seems unlikely and I'd agree with your doc in that case.
I think what you need to do is try to lift lighter weights for a while, and also try not to get up straight away after lifting. Just take 10 seconds to first unload your system, then get up slowly. That might help. It'll feel strange and unusual, but it should help a little. Then hopefully, it's just a phase and you'll find that in a few weeks, it's completely gone.
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