I am due to travel for the first time long haul early 2019. I always suffer with extremely swollen ankles and tightness of calf muscles even on a 4hr flight journey. I find it a bit scary. I don't drink alcohol pre or on board only consume lots of water, I also don't eat. I ensure my salt intake is to the minimum pre flight. I do get up and walk around as much as I can and do the seated exercises. Any other suggestions To stop this from happening? Thanks