I hear you. I'm not trying to scare you, but 14 months is about when mine started to get difficult, and just kept getting more so (He's 2.5 now). He's just got so much energy and is very strong willed.
Definitely lower expectations and do not join any Facebook groups where everyone is Super Mum, organising sensory activities daily, etc.
Can you afford ANY childcare at all. We sent ours to nursery at 14 months. Just 3 hours, 3 days a week. I was SAH but was pregnant and exhausted. We mainly sent him so that he was socialising (no friends or family nearby with children and no toddler groups have run here since March 2020) and got experiences that honestly couldn't be bothered to provide regularly at home, like painting, crafts, water play. But it was such a nice break for me. I'd do some Pilates, exercise bike, shower and cook/bake something. And he absolutely loves it there.
What does he enjoy? I'd stick mine in the bath for an hour some days! I'd play with him a bit, but often I'd just sit on the toilet on my phone just for a bit of quiet time (ordered a load of bath toys from Amazon).
I also read somewhere that's it's good for their learning to be a bit bored and learn how to play by themselves rather than being entertained all the time - don't care if it's not true, I'm going with it!
My boy is really well behaved and a joy to be with when we're at the playground. But some days I just can't face the battle to get his shoes on, get him in the car, hold my hand in the car park and the same back again. He drops to the floor and dead-weighs me, squirms and refuses to sit to get his seatbelt on, runs off and refuses to come back. I have a prolapse from his birth but I have no choice but to pick him up sometimes either for his safety or just to get somewhere. So we don't go out everyday and I try not to feel guilty about it.
I try not to feel guilty about him sitting in front of the tv sometimes while I get some work done. He is safe, warm, well fed, cared for and played with and read books to at other times during the day.
I try not to feel guilty when I really enjoy some time without him.
Lots of the day is a battle and not enjoyable, but I try to focus on those bits that are- when he's being lovely, when he's learnt something new (and nap time- nap time is great!). I'm also really trying to slowly change my diet. I eat crap and drink coke / coffee because I'm exhausted, and I'm more exhausted because I eat crap and drink too much caffeine.
Be kind to yourself. They change so quickly and will be at another stage before you know it. Maybe having a 5 year old will be more enjoyable, or a 10 year old, or 20 year old!!!