Re: Swollen Feet And Ankles.
I'm not on Synthroid, I'm on armour but fluid retention is a hypo symptom. It could be your body is sensing the addtional thyroid hormone and has reduced the amount it is producing causing you to be more hypo.
I would call your doc and tell him what is going on. An increase would probably help but most docs won't do an increase at two weeks and prefer to wait four to six weeks. I would tend to think more that it is a hypo symptom instead of a reaction to Synthroid. Someone on Synthroid will like as not chime in and tell you more.
Hope you get it resolved, I've dealt with fluid retention during my thyroid journey and it is not very pleasant.