I experienced the same effect at just 25mg of tramadol. It drastically improves my ability to stand and be upright, I basically feel normal. I have POTS and don't feel it at all. Now I will test my pulse to see if this is why.
Interesting that I get the improvement from POTS (alleviates my orthostatic hypotension and ‘fatigue’) at just 25mg. Any idea why this would be? Maybe low doses are also still boosting norepinephrine?
That said, when I take it a couple days per week to spend time with friends, I know not to overdo it. I still pace myself and lay down every couple hours. I only get mini-crashes one-day-long afterwards, so I know I'm not pushing myself too far.
It works very well for me in this way to have some quality of life in the social arena.