Talk to Endocrinologist on Thyroid

i m thyroid patient i m using thyroxine 2 tab daily but now i m very much over weight having pain in my body now doctor suggest me to stop thyroxine and start neomarcazol so can i stop.... is that neomarcazol is safe and secondly i want to know that i have heard that thyroid patient never stop their medicine is it true once thryriod medicine starts it is never stop