Wanting some encouragement

I’ve debated even if I should post but I figure i could use some encouragement. My LO is 5 months old and is generally an “easy” baby. He sleeps through night most nights and is pretty chill during the day. The biggest challenge we’ve had with him is with feeding - he rejected the bottle and sometimes can be difficult to BF though he is EBF and growing according to our paediatrician. I’ve been lucky enough that my partner has been able to stay with us for the past 5 months and we’ve even able to tag team during the day and nights. Now in about a week, he’s going back to work, after we come home from an international trip. I will be dealing with jet lag myself, my daughters jet lag, and my partner retiring to work the next day. Tbh I haven’t had a lot of confidence in myself as a mom. Even though by alll accounts my baby is doing well, I experience a lot of self doubt and sense of not being enough or doing enough. Lots of reason for this that I won’t get into here. I’m afraid of being home all day with the baby and not having option to tag team or trade off etc. and also I sometimes find I’m overstimulated and easily agitated and touched out and usually I can walk away and tag partner in but not being able to do this, I would hate to react to my baby which I have done before when she’s just being a baby. And then experiencing tons of guilt afterwards. Anyways I dont know what I’m really looking for just scared for our new routine and if I’ll be able to manage.