Recently I have developed puffiness below my eyes and irregular heartbeat.  Since 29 November I have ceased taking my 50mcg of thyroxin as blood test showed my TSH indicated it was too much at this time. My weight is also creeping up, having gained 5 kilos in the past 12 months.  I feel quite lethargic, tho I guess this is because I sleep badly.
Welcome to Chat Doctor .weight going up .irregular heart beat and puffiness eyes .high ts hall point towards low thyroxine level .please take thyroxine as proper dose as 1.5 microgm per kg per day .at empty stomach ...best of luck .