Craving sweets and bread related to thryroid problem?

for the past 3 or 4 months i have had this HORRIBLE craving for sweets and bread with butter on it. almost to the extint of thinking i may be pregnan sep since i gained about 5 lbst!! for about 5 months now i have been also feeling excessively tired, with no motivation, i want to get up and do things, i just am simply too tried and dont feel like doing it. i could not figure out why i have been so "lazy!" i got a call from my dr today with the results of some blood work they had done for a completely unrelated issue and they told me my thryroid count was low and that i have hypothyroidism, i had no idea what it even was, they told me the symptoms and its fits me to a T! and this whole time ive been thinking i have fallen into a bought of depression. after talking about some other issues and setting up another apointment to check my thyroid levels in 3-4 weeks she told me she would call me in a couple of perscriptions. i was so excited! finally some medicine that will get rid of this laziness, i will be back to myself again, but when i picked my perscriptions up...no thyroid medicine!!! why would they tell me all this and not treat it, just want to check it again in 3-4 weeks, i want to get this taken care of soon for ovious reasons, should i call my dr back and explain my concern and make sure that she understands i have been having these symptoms to such an extint?? or just ride it out??