I frequently get episodes of swollen feet and legs and hands and I suffer from sinus problems migraines, is there a link between the two symptoms?

Maybe. A common cause of foot/leg swelling and migraines is high blood pressure. Are you sure you are having a migraine? Describe your symptoms please?
Possible. Eating a lot of food with high contents of sodium can cause swelling in the feet and legs and give headaches as well.