The more people that tell you you are looking well the more you start believing it. In all honesty this probably is a better gauge than the mirror, scales, doctor or social media profile pictures.
It was these same people that questioned and commented on your ill health before you yourself acknowledged it. They noticed the change in demeanour and loss of weight before you consciously did. Therefore they might be on to something. It's a good springboard to realise yourself how far you've come and certainly gives some much needed caress to the confidence. Onwards and upwards.