@Annb - I must remember to ask my Physio where the fluid goes when he massages it out. I can relate to what you're going through as I've been there. I know, at least, what causes it. Post surgery (to relieve the flattened spinal cord) my legs and ankles were like tree trunks with fluid. I spent 4 days in flowtron boots, followed by compression socks while learning to walk again. I progressed to a zimmer, then 2 crutches. 2 years later, I was down to one crutch and was told that's as good as it gets.
They explained to me that the damage to the nervous system, caused by the accident & flattened spinal cord, had damaged the lymphatic drain. It was this damage that was causing the fluid build up in my legs/ankles. I've done everything. I had the compression bandages then the made to measure socks. I was taught by the physio I got for 1 year on home visits how to use body brushes to massage the legs to encourage the lymphatic drain. I forced myself into the gym/swimming pool but under strict rules from GP and supervision. I've got a home version of flowtron boots, a Revitive, and deep tissue massage guns. My legs have improved gradually over time but the ankles still swell, although nowhere near as bad as my tree trunk days. The legs are mostly OK apart from the tightening muscles which I can deal with.
I couldn't survive without my 4 weekly physio visit though. Once he knocks the fluid out of my ankles I get sometimes a couple of weeks relief plus he teaches me ways to deal with things to keep mobile. He also lectures me for overdoing things!
What's puzzling us at the moment it that something is definitely going on with my seriously screwed-up nervous system lately. There is no logic to these severe pins and needles attacks that are coming and going but, then leaving me with a bit more sensation each time. Logically, I should get referred back to neurology but when I asked myself did I want to subject myself to tests/MRIs etc at the moment the answer was No. I'd rather deal with it.
I appreciate your situation is different but it's worth trying everything and anything. At least now I don't touch my side and feel it in my foot!