Mom guilt during 2nd pregnancy, anyone else feel this way?

I have a 2 year old son and I’m 7 months pregnant with my 2nd. This pregnancy has been a lot harder on my body than my first was, I have had HORRIBLE fatigue the entire time which has honestly been the worst part. I live alone so on days where I’m tired I feel so bad for my toddler because I can barely get out of bed sometimes. Obviously not every day is like this but as I’m coming into the third trimester I can feel my energy plummeting even lower than it already has been. Literally all I want to do is sleep. Some days I have a hard time even holding my eyes open. My toddler doesn’t take naps during the day so I can’t sleep but I do just lay in bed a lot or lay on the couch all day while my son plays and it makes me feel so bad. I feel like he gets so bored and probably wonders why I don’t play with him as much anymore, I want to just get in the floor with him and play like we used to but I seriously don’t have the energy🤦‍♀️ my nausea has also been coming back this week so that’s been another thing I’m struggling with. I feel like the only time I get out of bed anymore or off the couch is to make food for him, change his diaper, get him a drink, necessities like that then I’m immediately laying back down. Did anyone else feel like this? Is there anything I can do to help increase my energy? I seriously feel like a walking zombie. I never experienced this at all with my last pregnancy.