Recovering anorexic weight was 135 is now 190 lbs. 6'3" male. leg pain and insomnia. relationship with food is healthy. why continuing symptoms?

Need more labs: you need to see a provider and have additional labs drawn looking at thyroid, adrenals, food sensitivities, minerals, electrolytes , etc. there probably is an imbalance related to the anorexia and gaining the weight back. You maybe eating correctly but not absorbing the nutrients. Also are you exercising and drinking enough fluids especially water See your provider for more tests