Night time rant

Does anyone feel super run down all the time? I’ve really been struggling mentally and emotionally with my two kids (my eldest is 2.5 years and youngest is 9 months). My son who’s turning 3 years in April might be on spectrum. I feel like every single day is a struggle. I don’t know if it’s normal to feel this way. I don’t want to seem ungrateful because I love them so much but I hate how exhausted I get. I have tried taking the kids to playgroups but my son just runs off or touches everything and I don’t want to run after him leaving my daughter in the pram. I have tried taking him to the park everyday and he loves it but he picks up everything off the floor and straight into his mouth. He has started to bite into our walls and eat the soil in the plants. He would even put some random dirt he found on the floor into his mouth. I feel like he craves it. I don’t know what to do about this. I have booked a blood test and bought him chew toys because they don’t satisfy him. He is constantly on his feet all day long and he struggles to sit longer than 2 mins. He’ll watch tv standing too. I feel like a horrible mum for putting the tv on to get all my chores done but I can’t find another way. He is happy when I’m playing with him because it doesn’t last longer than 5 mins. I’m constantly running after him as he climbs the child gate and kitchen work tops. He does enjoy lining his toys up and other problem solving toys but he gets bored. We woke up at 4:30am today so I’m knackered but he took a nap at nursery to he’s still wide awake. I feel like I don’t get a break. I’ve voiced this with my husband. He does get it and does change things for a day or two but as time goes I’m the default parent. Bare in mind I’m in charge of showering and changing kids, laundry, cooking, cleaning, kids appointments. Does it get easier?