help, advice please

ftm, baby will be 8w on thursday. i think i’ve pretty much got the hang of it when it comes to taking care of my baby and i wasnt really depressed after having him, just really anxious (i am an overthinker), which i am going to therapy for. my problem is how scared i feel on top of other emotions. my husband and i have both been off of work so we’ve been with eachother non stop since baby was born. hes always been my best friend but i feel like ive grown even more attached to him since being home with him (and losing literally almost all of my friends because to them i guess when you have a baby your life is just over.. whatever.) well he just started fall semester, he graduates in the spring, and man that first day of classes i just felt so lonely. i could handle the baby but i felt so alone it made me sad. and now i keep thinking about how hes going to go back to work too in a month and i’m dreading it so badly and when i think about it i get like this horrible pit in my stomach feeling. i dont know what i’m going to do. how do i not feel alone. i’m scared. i just want to cry. i want to tell my husband how i feel but i dont want him to feel bad, it’s not his fault and honestly i am so proud of him continuing his degree while having a newborn, i want him to not have to shift his focus on me when he already has to divide his focus on school and the baby. i just wish this feeling went away, or that my friends didnt just ghost me after i had my baby, then i wouldnt feel so alone when my husband is busy. i hate this.