Ftm.. no judgement or rude comments pls

I’m a ftm, my sons 8 months. I feel like I’m going crazy or some days kind of detached or like sometimes how my son would be better off with out me, like with someone else as a mom. Usually think like this when I’m trying to put him to sleep, which is another topic, am I too late to sleep train without crying it out? But I still feel like I’m going crazy throughout the day with him. Like the biggest relief when he finally is asleep, then when he wakes up 30-40 mins later I just wish he’d go back to sleep. I’m basically a single mom and with my son 24/7. I take him to work with me. No one else watches him or helps unless we’re all in the same room together. I’m thinking of switching to formula so I can have his dad pick him up for a week? He lives like 5 hours in a plane away. But idk, he works all the time and probably wouldn’t be able to take care of our son. I’m just so stressed and feel like I’m losing myself.