[euri13]

my 5 month old puppy is sick. yesterday morning he started whimpering and crying loud when the pain in his stomach is too much. he'll stand then sit with his back hunched forward after a minute he'll go back to laying on his side then the pain will returned and he'll repeat standing and sitting then laying down over and over.
this morning he seems to get better since he's not crying anymore but he'll just lay down and wont eat. he will drink water but only a little.
he has a history of having a too much water in his stomach.
last week,when i was feeding them their lunch, (i always watching them finished taking their food) i saw him suddenly drop down, he just lay down for a second and when he tried to stand he can't seem to stand straight and will always fall down, after 1 minute of laying down he stood and walk like nothing happened. i wonder what it was.
his body is healthy last week but it just suddenly lose weight.

does it have something to do with some type of ulcer. i forgot the name.
I think my dog is stress and trauma, 'cause he got bite thrice for getting too close from the other dog's food and whenever my two adult dogs is playing and biting playfully each other and he's too close to them he would cry and just duck. his sister always would bark at him and he would whimper.

i can't afford to take him to vet again because i'm just a freelancer and all the money i got from that work is spend in taking all my puppies to vet and buying their medicine. i have a antibiotic here and de-worm and i'm giving him that since the last two weeks they had a worm.