There are many reason why people get leg swelling, many health conditions can cause this. While it is true that the heat can cause this, it is also good to discuss with your doctor which is what you have done and test were also done to rule out health issues. When you stated meds to make you go, I presume you mean diuretics, which are given for heart disease and for kidney issues. If you are passing less urine it can be because in summer time many people get dehydrated, if this is the fact our bodies try and retain fluid and by gravity it will go to ankles and feet, unless you have kidney disease it is recommended to drink more fluids in summer times especially if heat wave. Another possibility can be that you need your medications adjusted. Either way you seem to have done what you needed to by letting your doctor know, prayers up that the tests might find out what is going on.

1 thing you can do is elevate your legs as often as possible to prevent the fluid from pooling in feet and ankles, summer times do cause this for many people even me, so when they get too swollen, I sit in recliner with legs up, it seems to be worse in summer time indeed. I do this several times a day if need be, some days I do not need to do so either, if I notice my right shoe gets tight that is my cue.

We also lose fluids through breathing, so if someone breathes more rapidly then usual they can lose more fluid, sweating is another cause of fluid loss.

Found this article which might help explain fluid loss and why our bodies retain water

https://medlineplus.gov/ency/article/001187.htm....

My legs are swelled and feet I have blisters on legs. Then they break and get infected. I have no feeling from knees down I take Furmoside for swelling its all water. Humalog 3x Lantus at night. I retain water alo t I did have heartfalure years ago because I was so sick I have chronic pancretits. Copd so I know what your going threw. I take one day at a time do you take any water pills it does help a little. I hope you feel better

It from the high heat drink lots of water and keep cool.

My legs swell all the time mainly when hot outside I wrap them in ace bandage I take Furmoside for water intake I do have neuropathy in legs. I do take metformin also along with many meds and 2 insulin but when hot out side your legs will swell. Plus I get blisters on legs when warm

If you have been dealing with Heart Failure in the past you should really get into your doctor or cardiologist

Swollen Legs in patients with heart issues is "usually" due to Edema as a result of reduced ability of the heart to pump blood properly to the extremities in the legs

Now it could be nothing more than too much time on your feet, but if you have a history of heart issues you need to get to the Doc sooner rather than later to figure out "what" is causing the swelling