Get medical grade compression stockings. 20-30 should be enough, but you can go higher. I have 30-40 but they take like 10 minutes to put on.

Measure your calf since they are sized according to your calf and not your foot. http://compressionsocks.pro/content/medical/images/Jobstformen20-30.jpg

Here's some cheapo ones https://www.amazon.com/Compression-Flight-Maternity-Athletics-Travel/dp/B01JZ8ELMU/ref=sr_1_3_s_it?s=hpc&ie=UTF8&qid=1483022965&sr=1-3&keywords=compression+grade+stockings

I used to buy Futuro from drugstore.com, they're pretty good. Amazon has them for both men and women. https://www.amazon.com/Futuro-20-30-Dress-Socks-Black/dp/B0057D826Y/ref=pd_sbs_121_2?_encoding=UTF8&pd_rd_i=B0057D826Y&pd_rd_r=8HA423HEY08ZPXQVFKKW&pd_rd_w=zx1sl&pd_rd_wg=F1ilV&psc=1&refRID=8HA423HEY08ZPXQVFKKW