Weight loss

Hi . I am in my 18th year with the unwelcome visitor!!
On the whole I do pretty well but I have been steadily loosing weight over the last 2 years… I was aroundc10 stone which fir my 5 ft height was about right too., I gradually went down to 9 stone but have very quickly gone to under 8 stone. I am painfully thin and its making me very depressed and withdrawn…
My PD nurse has suggested Calogen Shots… Has anyone tried them and has anyone actually put weight on?