underweight (not my question)

Emilè
'I'm underweight and I have started my period it sometimes happens sometimes doesn't but when it does it's always light, I get a ton of discharge (white,clear) and I've been to the doctors and they say I'm underweight for my height I'm 70pounds and 5ft3in I've not got a eating disorder and I don't want to be this skinny it's disgusting on me any tips on how to gain weight or regulate my period (mostly gain weight) Also I am very weak and frail I have broke 7 bones in my body and can barely pickup a toddler xx many thanks'