re: levothyroxine... Did your doc check the rate at which you're converting t4 to t3?
If your conversion rate is poor, it won't make a difference how much t4 (thyroxine) you're put on. t4 is more or less biochemically inactive (as compared to t3) where metabolic regulation is concerned.
And, unfortunately, t3 (brand name: cynomel/cytomel) isn't dispensed in Barbados...so a lot of people continue to suffer.