10 month old just cries all the time😫

I'm losing the will to live....
My 10 month old literally whinges and cries all day long, I have no idea why, I give him calpol incase he's teething, he's fed plenty, but he fights his nap times, and will scream hysterically when I put him down to nap which he never used to do. I'm pulling my hair out, I need advice?!