I am 43 female, my weight is 70Kg, height is 160

When I was 18 my weight was 90
them I managed to loose it to 65Kg in 12 months

since then I am struggling with the weight up up up and down then up up and down

the best diet was the Aitkin's but, I like carbohydrate (they make me happy), any way, , since the last 4 year I managed to keep it around 60KgK.

I eat now very little carbohydrate but the weight is up again

I was very good when I was 60 I need to go back to 60 but I cant
my activity level is good, I am a medical doctor and a researcher, so I move around on my feet since early morning until afternoon

Help