Maintaining/Weight Gain

Ughhh who els has the worst time keeping weight on and gaining! With my first baby I breastfed till he was almost two..I lost over 60 pounds and was sickly thin! I had my seconded baby here last month. breastfeeding again and I’ve lost over 30 pounds…which is normal but I’m so scared I’m gonna lose what weight I have left cause it’s SO hard to eat over 2,000 calories a day for what I need. Anyone stop breastfeeding cause you were scared to lose SO much weight ? I haven’t stopped yet but I’m thinking I’d like to cause I don’t want to be that sickly thin ever again. I’ve been eating like a horse but yet I lost 3 pounds in just one week…i don’t know what els to do