Ridiculous question about weight

I recently lost 60 pounds. I went to the doctor and he told me I am a little too thin so to gain about 10 pounds in order to be healthy. I have been eating a lot more the last 3 weeks and I have only really gained about 1 and a half pounds so far. Not sure how I havent gained more because I have been eating like crazy. When I look at myself naked in the mirror now I feel like I look bigger. My hips look bigger to me. I don't know if I am just over thinking it or what. Like I know I need to gain weight but a part of me doesn't want to. I feel like I have a problem almost. My husband keeps telling me it isnt possible for me to notice 1.5 pounds but I feel wider idk. Is it possible to gain inches around your waist and all that without gaining tons of weight or is it all in my head? Once again I know its dumb and I probably sound insane.