What Is The Cause For Pain In The Thumb And Hair Fall?

i'm 34 yrs old,5'2 in height&57kg.i undergone radio active iodine year 2001 for my hyperthyroidism.last march i've delivered a baby boy.my hand muscles esp.the thumb are aching and up to this time.likewise my internal med.doctor told me to stop taking thyrax 100mcg because my thyroid function test was already normal.i have a lot of falling hair this time.what do you mean with what is happening with now?thanks much.