Sounds like edema. I have that and I have problems with swollen feet especially my right foot. Doctor thinks the swelling is there as a result of my heart bypass surgery; several veins were removed from my right leg to my heart.
I notice that if I don't eat a lot of high sodium foods the swelling will go down. I don't think the swelling in my feet - especially my right foot will go away. I dread squeezing my feet into my shoes. I wonder if that's the case with you?
You might want to get your thyroid and kidneys checked as well as problems with either one can cause swelling.
While I am in the early stages of kidney disease, the swelling was not caused by my kidneys as I have no symptoms other than that I'm passing protein in my urine.