Weight gain (oedema) headache tired.

On Easter Friday I was happy as ever for a long time. Following Tuesday I started to feel head ache and weight gain. On Wednesday I had severe Oedema in face under eyes and on lids, headache severe and constant. I also had nausea. In total I gained 10 lbs within 6 days. The following days I felt as bad as ever. I saw Dr yesterday, and they took some blood but didn't check blood pressure. I am female, 44 years old and very good shape. Eat healthy work out and cardiovascular training 5 or 6 days a week. I weight 137.5 on Easter Friday (same that month) ando gained to 148.I lbs. I cannot use my boots now and left leg is slightly worse than right. I am almost 5.7 tall. I have been taking 50 to 75 micrograms of thyrolevaxine the latest 6 months. Last checkup my levels were good (4 months ago). I also take water retention tablets (small amount) and iron pills for when I have my period. I need to eat very little to keep my weight, 1300 kcal or I tend to gain fat on tummy (new to me).