Leg lymphedema post radical prostatectomy

Dear Support community -

I had a radical prostatectomy 4 months ago. As a result of lymph node dissection, I can’t walk for more than 15 min without my leg going numb and now I have significant swelling in my lower leg and foot. And I used to be a very active person before the surgery.

CT scan showed lymphedema.
Did any of you have this condition and what treatment proved successful for you?
Thank you very much in advance for helping me to get my life back.