Welcome to HCM
Your symptom is indication of fluid retention that caused swelling of the legs. Oedema, swelling, leg cramps
can be side effect of the said drug that you have been taking but it can be due to thromboembolic problems also.
Side effect can be an option for your swollen legs but you need to get examined by a clinician to rule out any developing thromboembolic disease
, get thyroid function tests
and other fitness tests ( USG of the uterus to rule out fibroid, endometriosis
) done and get properly treated for the cause.
Weight gain, thyroid problem, hormonal
imbalance, bleeding problems can be related. Exercise regularly, take balanced nutritious food, keep well hydrated, sleep well. I hope my answer is helpful. Take care.