devastated fiance of late ` wellness warrior ' jessica ainscough writes touching tribute to followers .
ainscough , 30 , died in february following a lengthy fight with a rare and aggressive form of cancer .
she advocated treating cancer with a vegan diet and coffee enemas .
partner tallon pamenter , who she was to marry this year , said : ` my heart is in a million pieces '
` this year has stripped me from the one thing that brought magic to every aspect of my life '
mr pamenter also revealed she underwent radiation in her final weeks .