DVT is terrifying. My understanding is that a single blood clot would cause symptoms in one leg.
The problem is that doctors don’t always look at the issue that you’re coming to them for. Instead, like you said, they go off on a whole long list of things you “should” be worrying about. (You’re not alone with the PCOS by the way.) Have you ever tried an urgent care center instead? I go to CityMD for pretty much everything because they literally only focus on the ailment that you came for. If you go in and say “Is this a blood clot?” they’ll only look to see if it’s a blood clot and then they’ll send you on your way. Worst case scenario, if it’s an emergency, they’ll send you to the ER. Otherwise they’ll probably just calm your fears and send you on your way.
I was convinced I had a DVT once and ran into City MD where they said, “It’s a bone bruise. Don’t know how you managed to get a bone bruise there, but you did. You can go home now.”