Radiesse only lasted two weeks?

It is likely that not enough Radiesse was used to produce the results that you wanted.  There normally is some immediate swelling with the injection, and this contributed to the amount of augmentation you were seeing.  When this swelling resolved, it made your result less obvious.  The Radiesse that was injected has not gone away but you most likely need more to obtain the amount of augmentation that you desire.  

I am unsure your age or degree of volume loss with no pictures to go on so it can be difficult to fully answer your question.  Many injectors will tell their clients that they absolutely need 2 syringes (1 syringe per cheek) to appreciate a difference.  I know injectors who will even refuse to treat clients that only want to be treated with one syringe for this very reason.  The product does not degrade quickly enough that it would have dissipated already but most likely one syringe was not adequate.  Before and after pictures often can help and perhaps a follow up consultation to compare results may be helpful.  I hope this helps!

I don't think that your Radiesse has dissolved. The more likely explanation is that you've simply gotten used to your appearance and you probably wish to have a more dramatic effect in which case you would need additional fillers. I would recommend that you look at your photographs before and after the treatment for your personal satisfaction. Good luck from New York City