It's easy to search for OT on the internet if you know what you are searching for, but what if you are searching for a feeling or sensation before you knew it was OT. How did you describe it to your Doctor? "a jelly-like feeling of the legs on standing" ? There isn't a right answer here, just the feeling, and how you expressed it in words.
The descriptions that you used may have been simple, unusual or even .... weird, they are all welcome. But, they may be the exact words of someone that is walking into a doctors office right now.
Let's see if we can help people that are searching for answers, reply to this post with the words and thoughts that you used before you knew it was OT:
Doctor, I have this feeling______________