brittle thyroidism

there're these old terms brittle asthma and brittle DM, which refer to people with very poor control of asthma & diabetes... here poor control doesn't mean that someone is always out of breath... or that blood glucose level is always high... but the control is somewhat like a roller-coaster, fluctuates a lot... very high this minute and very low the next...

i'm thinking i may have "brittle thyroidism", at times i'm very hungry, eat plenty, efficient at work and keep talking talking... sometimes i'm slow, sleepy, very very tired and constipated... perhaps i should do a Q1H free T4 monitoring...