i HAD MY THYROID ZAPPED ABOUT THREE YEARS AGO DUE TO OVERACTIVE THYROID FUNCTION WHICH MADE ME VERY WEAK, OUT OF BREATH, FATIGUED, SWEATING, DIZZY, ETC. AFTER CHECKING OUT MY HEART THEY DID BLOOD WORK AND FOUND MY THYROID PROBLEM. AM AT PRESENT TAKING 125 MG SYNTHROID ONCE DAILY IN MORNING. WAS UP TO 150 MG FOR A WHILE BUT AGAIN DUE TO SYMPTOMS AND BLOODWORK TOO HIGH NOW LOWERED. HOWEVER, NOW GETTING FATIGUED EASILY, BREATHLESS WHEN DOING SOME ACTIVITY, WALKING A BIT. STAIRS, ETC. WOULD ACTALIN BE ADVISABLE TO TRY ALONG WITH MY SYNTHROID.... WOULD YOU SUGGEST SEEKING ENDOCTRINOLOGIST FOR FURTHER ASSESSMENT/