4 month old sick

Abby

Past two days hes been acting weird like fussing more than usual like he in pain also has been pooping more than usual. He usually poops once every couple of days but now poops two times a day and its green now instead of yellow , tonight hes projectile vomited 4 times and refuses to eat and feels hot to touch i would take his temp but i cant for the life of me find his thermometer, but also havent been able to really look for it because im rocking him in my arms as of now and if i stop he wakes up crying like hes in pain... and my baby dont cry he whines but only crys when something is wrong with him like getting a shot he doesnt just cry thats not normal for him .... also im breastfeeding him theres been no change in diet