I guess it was about 3 years ago when I was diagnosed with hypothyroid and after I started taking Synthroid and the slowly increased my dosage, I started feeling better, dropped weight, etc. Recently, as I go back every 3 months for labs, they have had to increase my dosage and I'm now up to 200mcg. I was taking 150mcg for the longest time, then 175 now 200 and yet I'm still fatigued, gaining weight and I eat very little and very healthy. I've already had an utlrasound done which came up with nothing. Is there anything over the counter or foods that I should be eating to get back to where I was? I have also recently been suffering from what seems like a very slow digestive system only to have my RPN tell me to take Zantac 150 when I described my symptoms.