Clingy Toddler wont let me do anything!!

My toddler is exactly 18 months old. He's a happy go lucky kid, Im a SAHM, and this is my only baby. Recently we went on a trip to visit my parents and since coming back a month ago, he's more attached to me than usual. I've become the favorite parent instead of his dad, and he wants to spend every waking moment with me- wont let me cook, or do anything else including going to the bathroom. Even Miss Rachel wont distract him, and I have to hear wailing until I come out in 30 seconds. This is causing me to have burnout and I find myself becoming very agitated. He's also falling sick quite a bit and its one issue after another- teething, viral rash, strep throat!
Earlier he would play with his toys and be obsessed with his dad, now he wants to come to me even if he's in dad's arms! While sick, even when he was asleep he would scoot over to my side of the bed and slept constantly caressing my arm which sounds sweet but caused me to be sleepless. I feel like I havent rested in so long and want to run away from the house! I cant pee, I cant shower, cant use my laptop, cant talk on the phone, nothing. Even when we go out he wants us to carry him or runs around without getting tired. We cant put him in daycare yet and we limit his interaction with other kids as he falls sick immediately and has been hospitalized 4 times the past year. We take him on walks and play with him, buy him all the toys and read books with him but we arent able to handle his separation anxiety! Any tips would be greatly appreciated!! I need to find a way to make time for myself, and make him a little more independent, without causing breakdowns! Thank you.