Really struggling

I just posted on here a few days ago about this but I really need help. I'm doctor thinks my five week old has colic I think it's something else, he will not sleep at night crys and acts like he's in pain and he hardly sleeps during the day, his symptoms are: crying a lot pulling his legs to his tummy having a hard time pooping, spits up everyday, gets the constant hiccups, making choking and gaggin sounds out of random. I'm so exhausted and idk what to do or think