Leg pain and swelling of shin area under knee.

I just wanted opinions on what my case can be since my doctors are not sure and my test results aren’t showing anything.
So I’ve been having multiple struggles for about a month and some now that the doctors all said is anxiety. Various different symptoms and one of them mainly being leg pain that moves from one leg to the next.
It first started off as burning behind my knee and calves in the night when I’d try to sleep, then waking up to almost getting cramps in my calves. Then I’d get like an aching pain in the day so I did a D Dimer blood test which came back normal. My doctor recommended voltaren and said my muscles may just be contracting and tense from the anxiety.
I used it and it provided temporary relief.
However, the pain persisted and took on various forms like a stinging, aching, pulling sensation. It varies between when I’m resting or walking. I’d sometimes get temporary relief when I’m active.
I also noticed some swelling on my right shin since May 6th and it’s been 9 days now and it hasn’t gone down.
I did a Doppler ultrasound and no DVT or venous insufficiency was found neither insufficiency with my arteries.
They said that the swelling was in the soft tissue and could just be localized inflammation. They had a question mark next to local lymphedema. My GP was not sure and told me to just monitor it. I’m not getting pain from the swollen area per se, no warmth or tenderness.
He prescribed some muscle relaxers also for the other leg pain but I don’t find they’re really working.
What cause this mysterious pain and swelling in my legs be from? Is it really just anxiety symptoms and the swelling unrelated?